Whats the Very Fragile Stone Blue and Black
Actinolite
Actinolite is a member of a series that contains varying amounts of iron and magnesium. Tremolite is ...
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Adamite
Although adamite occurs in many localities, it's very rarely cut as a gem. This mineral is much too ...
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Agate
Agate is a variety of chalcedony that exists in many colors and is often commercially dyed. Agate is ...
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Albite
Albite, usually colorless but sometimes yellow, pink, gray or reddish. Translucent albite is sometim ...
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Alexandrite
"Emerald by day, ruby by night," alexandrite is well known for displaying one of the most remarkable ...
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Algodonite
Bright, silvery metallic cabochons of algodonite and domeykite are attractive and unusual. Faceted p ...
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Almandine Garnet
Almandine is perhaps the most common garnet species. Forming series with pyrope and spessartine garn ...
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Amazonite
A green to blue-green variety of microcline, amazonite makes a wonderful gemstone for cabbing and ca ...
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Amber
Amber is the hardened resin of ancient pine trees. This organic substance is most well-known for the ...
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Amblygonite
Amblygonite gems are usually pale straw yellow. Although they are too soft and cleavable to make goo ...
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Amethyst
Amethyst is crystalline quartz in colors ranging from pale lilac to deep reddish purple. The Februar ...
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Ametrine
Ametrine is a variety of quartz that displays bands of both amethyst purple and citrine yellow. Thes ...
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Ammolite
Ammolite is a rare, iridescent, gem-quality material cut from the fossilized shells of extinct sea c ...
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Analcime
Large colorless crystals of Analcime are a great rarity although small transparent crystals are abun ...
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Anatase
Anatase occurs in many beautiful colors, such as deep indigo and amber yellow. However, these rare g ...
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Andalusite
Strongly pleochroic, andalusite can show shades of green, brown, and red when viewed from different ...
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Andesine
These feldspars are rarely encountered in gem form. Andesine's occurrence is widespread throughout t ...
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Andradite
Andradite is one of the most sought after garnet species. Although more sources have been discovered ...
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Anglesite
Although anglesites with pale colors can show great dispersion and brightness, they're difficult to ...
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Anhydrite (Angelite)
Rare and difficult to cut, anhydrite is seldom faceted. However, this material can be carved into be ...
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Anorthite
The rarest plagioclase feldspar, anorthite is very rarely faceted.
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Apatite
Although too brittle for most jewelry use, properly cut apatite gems are truly magnificent. A collec ...
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Apophyllite
Although not suitable for jewelry, apophyllite is a popular collector's piece. Perhaps the whitest o ...
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Aquamarine
Named after the color of sea water, aquamarine is the blue to blue-green member of the beryl family. ...
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Aragonite
Aragonite is more commonly found as a constituent of pearl and shell nacre than as a crystal suitabl ...
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Augelite
Soft and brittle, rare augelites are difficult to cut and unsuitable for wear. Faceted transparent p ...
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Axinite
When faceted, the members of the axinite mineral group are usually intensely pleochroic, with rich b ...
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Azurite
Collectors prize deep blue azurite crystals, but faceted gems are extremely rare. However, azurite f ...
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Barite
Massive white barite (also called known as baryte) looks like marble and could be used for decorativ ...
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Bayldonite
Bayldonite is a nondescript greenish material that has been cut into cabochons by enterprising colle ...
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Benitoite
With dispersion higher than diamond and sapphire-blue body color, benitoite is one of the most attra ...
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Beryl
The beryls are among the most popular, and also the most expensive, of all gems. A wide range of col ...
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Beryllonite
Difficult to facet and typically colorless, beryllonite is a rare collector's gem. Some specimens ca ...
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Bismutotantalite
Extremely rare as a cut gem, even in very complete collections. Many of the minerals in the tantalit ...
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Bloodstone
Also known as heliotrope, bloodstone is the traditional March birthstone. This dark green, opaque ch ...
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Boleite
Cut boleite is strictly for collectors, since it is soft and very rare. Faceted gems of any transpar ...
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Boracite
With light blue and green colors, no cleavage, and high hardness, boracite is an uncommon mineral. U ...
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Bornite
Bornite is suitable only for cabochons. The bronzy color rapidly tarnishes in air to a magnificent i ...
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Brazilianite
Brazilianite's lovely green to yellow colors make it a must for gem collectors. Large faceted stones ...
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Breithauptite
Breithauptite is a curiosity cut for collectors, although it could be worn with care in jewelry. The ...
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Brookite
Brookite usually occurs in very dark colors, transparent only in small fragments. Cuttable crystals ...
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Brucite
Brucites are extremely difficult to cut. Although too soft for jewelry use, faceted pieces would be ...
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Bustamite
Bustamite is very similar in appearance and properties to rhodonite. The Japanese crystals are very ...
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Bytownite
Although bytownite occurs throughout the world, this feldspar variety is rarely encountered in gem-q ...
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Calcareous Concretions
Several species of marine mollusks produce stony growths called calcareous concretions or non-nacreo ...
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Calcite
Calcite is common and abundant throughout the world. The material has little intrinsic value since i ...
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Canasite
The material usually seen on the market as "canasite" is purplish in color. It is frequently confuse ...
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Cancrinite
Cancrinite is one of the most attractive of all opaque or translucent gem materials. It is a bit too ...
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Carnelian
The best-known and generally least expensive variety of chalcedony is carnelian. It ranges in color ...
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Cassiterite
Cassiterite is a durable gemstone with tremendous dispersive fire, especially visible in properly cu ...
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Catapleiite
The only reported cut catapleiite is from Mte. Ste. Hilaire, Quebec, Canada, in the form of tiny col ...
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Celestite
Soft, fragile, and hard to cut, celestite or celestine is seldom seen in gem collections. These gems ...
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Ceruleite
A little-known gem material of truly exquisite color, sky-blue ceruleite takes a very high polish ea ...
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Cerussite
As beautiful as a diamond, a faceted cerussite actually has higher dispersion and usually excellent ...
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Chabazite
Although faceting chabazite isn't too difficult, it's too soft for jewelry. However, only a handful ...
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Chalcedony
Technically, chalcedony (kal SED' uh nee) is any form of microcrystalline or cryptocrystalline quart ...
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Chambersite
Chambersite is an exceedingly rare mineral. Although it has properties suitable for jewelry use, its ...
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Charoite
With light to medium dark purple colors and swirling patterns, charoite is one of the few gemstones ...
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Chicken-Blood Stone
One of the most prized ornamental materials in China, chicken-blood stone has been used for centurie ...
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Childrenite
Cut childrenite is a great rarity, and all gems are small. Cut eosphorite is more abundantly availab ...
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Chiolite
Chiolite makes a challenging gem. It's difficult to cut, extremely rare, and has little appeal. It's ...
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Chromite
Chromite is shiny and black, and makes a curious-looking cabochon with no special attraction. Occasi ...
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Chrysoberyl
Although many gems show a cat's eye effect, when the term "cat's eye" is used alone, it always refer ...
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Chrysocolla
Pure blue chrysocolla is extremely soft but interesting to gem collectors. On the other hand, chryso ...
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Chrysocolla Chalcedony
Marketed as "Gem Silica" this relatively rare, blue to blue-green, opaque to near transparent materi ...
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Chrysoprase
Chrysoprase is apple-green chalcedony that derives its color from nickel. Its hardness and striking ...
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Cinnabar
Magnificent red cinnabar is extremely soft and fragile, so faceted material is rare. It's cut primar ...
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Citrine
Citrine is the yellow to red-orange variety of crystalline quartz. Clever marketing and the rise of ...
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Clinochlore
Clinochlore is a family of minerals in the chlorite group. To date, only kämmerite and sheridanite v ...
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Cobaltite
Cobaltite cabochons can have a lovely metallic luster. However, this gem material is very seldom fac ...
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Colemanite
Colemanite is an abundant mineral, and transparent material isn't rare. However, gem cutters rarely ...
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Color Change Garnet
Any stone that changes color under different types of light is a rare treat for collectors. Color ch ...
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Color Change Sapphire
Color change sapphires are those that change color between light sources.
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Coral
Coral is the external skeleton of a tiny, plant-like marine animal called the coral polyp. The struc ...
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Cordierite
The crystal structure of cordierite has many similarities to that of beryl; indialite, the dimorph, ...
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Corundum
Next to diamond, corundum is the hardest mineral known and is very compact and dense, with no cleava ...
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Covellite
Although covellite has attractive blue colors and shows iridescence, this rare mineral is difficult ...
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Creedite
Probably fewer than a dozen creedite gems have ever been faceted. This rare mineral is rarer still a ...
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Crocoite
Lovely saffron-colored crocoite is quite a rare mineral. Although too soft and brittle for jewelry w ...
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Cryolite
Typically colorless with a "sleepy" look, cryolite is rarely found in nature. Rough suitable for gem ...
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Cuprite
One of the rarest of all facetable gems, cut cuprites can show magnificent deep red color. However, ...
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Danburite
A very durable gemstone, danburite is an excellent choice for jewelry use. Although the mineral isn' ...
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Datolite
Polished and sliced datolite nodules can show off very attractive colors. Datolite is a popular coll ...
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Demantoid Garnet
One of the rarest garnet varieties, demantoid can have a green color that rivals emerald and a fire ...
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Diamond
Diamond is the most romanticized and heavily marketed of all gemstones. Nearly every jewelry establi ...
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Diaspore
Diaspore is hard enough to make a durable jewelry stone, but the typical light brownish color is not ...
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Dickinsonite
This mineral is seldom even mentioned in the gem literature because it is so rare and has been so se ...
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Diopside
Violane has been used for beads and inlay—transparent material is always very tiny. The color of thi ...
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Dioptase
Dioptase has a beautiful, emerald-like green color. Although this mineral isn't rare, gems are seldo ...
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Dolomite
Although transparent dolomite crystals are fairly abundant and popular collector's items, faceted ge ...
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Dumortierite
Dumortierite is a beautiful and very hard material, eminently suitable for jewelry. The cabochon mat ...
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Ekanite
A relative newcomer to the world of gemstones, ekanite is rare and usually quite radioactive. When c ...
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Emerald
Emerald has been synonymous with the color green since ancient times. A fine emerald is a truly brea ...
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Enstatite
Most gem enstatites have indices in the range 1.663-1.673. The brown and green gems from Tanzania ar ...
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Eosphorite
Faceted eosphorites in pale colors are quite attractive and easy to cut. However, these very rare ge ...
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Epidote
The epidote mineral supergroup contains many related species of interest to collectors. However, epi ...
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Ettringite
Ettringite is not generally facetable. Any cut stone would be considered an extreme rarity.
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Euclase
Although hard enough to be worn safely in jewelry, euclase in beautiful colors is rare over a few ca ...
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Eudialyte
Although lapidaries can cut cabochons and decorative objects from massive or translucent eudialyte c ...
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Euxenite
Euxenite is seldom seen in collections. Most collectors would not regard the mineral as facetable, b ...
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Feldspar
Feldspars are the most common minerals at the Earth's surface. In fact, if the entire composition of ...
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Fergusonite
This mineral is not abundant and is known from various localities. Cabochons are cut merely as curio ...
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Fluorite
Although too fragile for most jewelry use, fluorites are often faceted for collectors. They occur in ...
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Freshwater Pearl
Like their marine cousins, many freshwater mollusks can produce pearls. However, this rarely occurs ...
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Friedelite
Friedelite is not abundant, and gem-quality material is rarely seen even in large collections. Facet ...
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Gadolinite
This is not a terribly attractive gemstone, but faceted gems would be a tremendous rarity. The mater ...
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Gahnospinel
Gahnospinel is a solid-state solution between spinel and gahnite.
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Garnet
Although commonly associated with the color red, garnets can be found in almost any color and are po ...
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Gaylussite
This mineral is very hard to cut because of extreme softness and cleavage. Gaylussite dries out slow ...
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Glass
Glass has been used in jewelry for thousands of years. By itself, glass is brittle and unimpressive ...
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Grandidierite
A rather rare mineral, lovely blue-green grandidierite is seldom seen in gem or jewelry collections. ...
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Grossular Garnet
Grossular garnets come in almost every color, even colorless, except blue. However, unlike other gar ...
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Gypsum
Gypsum is one of the most abundant minerals, but gem-quality crystals are very rare. This material i ...
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Hambergite
Although hard enough for jewelry use, rare hambergite is a gem for collectors of the unusual. Its co ...
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Haüyne
One of the major mineral constituents of lapis lazuli, haüyne is rarely found and faceted as a disti ...
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Heliodor
Heliodor is a member of the beryl family. This stone is known for its range of yellow colors — from ...
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Hematite
Hematite has a long history of use as a pigment. As a gemstone, this material is often carved but ve ...
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Hemimorphite
Massive hemimorphite can have a very delicate, blue color. However, it's seldom cut because not very ...
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Herderite
Herderite is a rare collector's gem, especially in larger sizes. Although too soft for daily jewelry ...
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Hessonite
Also known as the "cinnamon stone," hessonite is the yellow-orange to reddish orange variety of gros ...
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Hodgkinsonite
Hodgkinsonite is one of the rarest of all collector gems. Cut stones are bright and richly colored, ...
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Holtite
This mineral was first noted in 1937 but was not described in detail until 1971. It has not yet been ...
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Howlite
Howlite is always opaque in nodules; it is an abundant material and easy to acquire. Sometimes it co ...
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Huebnerite (Hübnerite)
It should not be difficult to find numerous small faceted huebnerites among larger gemstone collecti ...
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Humite
Clinohumites and chondrodites can make beautiful gemstones with rich colors, but these members of th ...
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Hureaulite
Hureaulite can show rich and lively pink, rose, and orange colors. However, this collector's gem is ...
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Hurlbutite
Hurlbutite is an extremely rare mineral. Minute, colorless faceted stones have been cut from fragmen ...
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Hydrogrossular Garnet
Hydrogrossular differs from the other garnets in that it is never transparent. It ranges from transl ...
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Hyperitdiabas
Hyperitdiabas is one of the most outstanding minerals I have encountered in recent years. Its appear ...
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Idocrase (Vesuvianite)
Idocrase is one of the lesser known and more beautiful collector gems. When properly cut it is as br ...
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Inderite
Inderite is very soft and difficult to cut, and only a few stones have been cut by hobbyists. There ...
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Iolite
This stone, which represents one of the few relatively available and affordable blue stone options, ...
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Jadeite
One of two distinct minerals commonly known as jade, jadeite is the rarer and harder variety. Rich e ...
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Jasper
Jasper is an opaque, solid or patterned variety of cryptocrystalline quartz. All types of jasper tak ...
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Jeremejevite
Jeremejevite would make a durable and attractive jewelry stone, but this rare mineral occurs even mo ...
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Jet
Historically a popular black gem, jet has declined in popularity in modern times. Although jet jewel ...
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Kornerupine
Star kornerupine also has been found (Mogok, Myanmar) but is very rare. Kornerupine is generally dar ...
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Kurnakovite
Kurnakovite is difficult to cut, inadvisable to wear, and usually colorless. Consequently, faceted s ...
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Kyanite
Kyanite's physical properties make it very difficult to facet. However, it's a popular collector's g ...
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Kämmererite
A beautiful but rare mineral, kämmererite is extraordinarily difficult to facet. As a result, the av ...
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Labradorite
An overview on Labradorite Jewelry and Gemstones. Covers details and essential information on the ph ...
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Langbeinite
This material is nondescript and is cut solely as a curiosity. The gems are soft, pale colored, or c ...
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Lapis Lazuli
Lapis lazuli has been used since ancient times and remains popular today. This gemstone has been pri ...
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Laserblue
Laserblue is a rare, synthetic glass. It's hard for glass but easy to chip.
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Lawsonite
Lawsonite is extremely rare as a faceted stone, seldom reported and generally unavailable.
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Lazulite
Lazulite makes a magnificent, deep blue gemstone. Although the mineral itself occurs widely, gem-qua ...
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Legrandite
Too soft for jewelry use, legrandite is a popular collector's mineral because of its intense yellow ...
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Lepidolite
Reddish granular or massive lepidolite is usually slabbed for ornamental purposes, such as ashtrays ...
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Leucite
Although abundant in various lava rocks, leucite is extremely rare in gem-quality form and often has ...
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Linarite
The blue color of linarite is magnificent, and it is a pity that large facetable rough has not been ...
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Ludlamite
Ludlamite has a lovely green color, but cut stones are extremely rare. Large crystals of this phosph ...
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Magnesite
Transparent, gem-quality magnesite is rare and beautiful, with colors ranging from colorless, white, ...
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Malachite
Malachite is a beautiful decorative stone. Its rich, patterned coloration in shades of green is uniq ...
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Malaia Garnet (Malaya Garnet)
Malaia or malaya garnets are typically light to dark, slightly pinkish orange, reddish orange, or ye ...
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Mali Garnet
One of the rarer varieties in the garnet group, Mali garnet is a blend of grossular and andradite. T ...
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Mandarin Garnet
While the colors of spessartite garnet gemstones cover a wide range of orange shades, the mandarin g ...
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Manganotantalite
Manganotantalite makes a spectacular red brown gem that is a very rare collector's item. Transparent ...
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Marcasite
Marcasite has a long history of use as a decorative and jewelry material. However, this brassy color ...
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Meliphanite
Meliphanite is an extremely rare gemstone, and perhaps fewer than 5-10 faceted stones have ever been ...
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Mellite
Mellite is a rare and unusual organic gemstone. Although soft and fragile, the "honey stone" is quit ...
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Microcline
Microcline is a variety of feldspar. The only microcline you are likely to encounter is amazonite.
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Microlite
Ranging in color from pale yellow to brown, reddish, and green, microlite cabochons are prized by co ...
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Milarite
Very rare milarite crystals can occur in green and yellow colors. Transparent material can yield sma ...
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Millerite
Millerite has a rich, attractive yellow color. Massive millerites can sometimes be cut into cabochon ...
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Mimetite
Transparent mimetite crystals are extremely rare, and very few have ever been faceted. Cabochons wit ...
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Moldavite
An olive to bottle-green natural glass, moldavite is a rare material popular with collectors of unus ...
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Monazite
Monazite may be partially metamict, with N=1.79. Stones can be an attractive yellow or brown color b ...
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Moonstone
Found all over the world, moonstone is prized for its blue to white adularescence — a billowy, moonl ...
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Mordenite
Compact, fibrous material is cabbed because the fibers provide a chatoyancy that sometimes yields we ...
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Morganite
A member of the beryl family, morganite shows a range of pink colors due to traces of manganese. Rec ...
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Nambulite
The color of Namibian nambulite is a striking orange-red, very intense, and not really like any othe ...
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Natrolite, Mesolite, Scolecite
All three minerals are fibrous or elongated zeolite minerals. Faceted gems are almost always elongat ...
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Natural Glass
Glass comes in several natural forms. All are used in jewelry.
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Nepheline
A variety called elaeolite is red, green, brown, or gray, massive or in crystals filled with minute ...
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Nephrite
Nephrite is one of the two distinct minerals commonly known as jade. While nephrite doesn't match th ...
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Neptunite
An overview on Neptunite Jewelry and Gemstones. Covers details and essential information on the phys ...
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Niccolite (Nickeline)
Niccolite's delicate peachy red color and metallic luster looks beautiful when polished. Gem cutters ...
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Obsidian
Obsidian is the most common form of natural glass and occurs in many attractive varieties. Since pre ...
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Oligoclase
Oligoclase gems are feldspars that are part of a solid state series between albite and anothrite.
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Onyx
For millennia, artisans have carved intricate cameos from black-and-white onyx. Solid black onyxes, ...
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Opal Stone
Opals are in a class by themselves. As a species, opal is so unique it has its own descriptive vocab ...
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Oregon Sunstone
While feldspar sunstones from sources around the world have been used for carvings and cabochons, Or ...
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Orthoclase
Orthoclase is best known for moonstone. It is occasionally a transparent, faceted gem.
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Padparadscha Sapphire
Padparadscha is a light to medium toned pink-orange to orange-pink hue sapphire.
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Painite
Until 2001, only three painite crystals were known to exist. Since then, additional discoveries have ...
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Palygorskite
Although marketed as "angel skin opal," "rock wood," and "mountain leather," palygorskite is neither ...
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Papagoite
Cerulean blue papagoite crystals are too small for faceting. However, massive material mixed with qu ...
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Paraíba Tourmaline
Discovered in 1989, paraíba tourmalines are among the world's most prized gemstones. These rare gems ...
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Pargasite
The amphibole group is very large and extremely complex and contains numerous distinct species that ...
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Parisite
More well-known as rare inclusions in emeralds, parisite crystals are usually small and seldom facet ...
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Pearl
Pearls are the only gems found within living creatures, both salt and freshwater mollusks. However, ...
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Pectolite (Larimar)
Fibrous pectolite has long been a curiosity for gem collectors. Compact material can make wonderful ...
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Pentlandite
Pentlandite resembles other yellowish metallic minerals and is cut by collectors as a curiosity. The ...
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Periclase
Periclase has been synthesized in large masses in the laboratory, but these have no market significa ...
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Peridot
The modern August birthstone, peridot has been prized as a jewelry stone since ancient times. Always ...
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Peristerite
Peristerite is primarily oligoclase with a complex mixture of feldspars. It has iridescence that is ...
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Perthite
Perthite is a blend of microcline, albite and oligoclase. It is usually brown and white. May have go ...
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Petalite
Gem-quality, colorless, facetable petalite is rare and desirable to collectors. More so if the stone ...
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Phenakite
Rare phenakite is a very hard gem material suitable for jewelry. Usually colorless, cut stones have ...
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Phosgenite
Rare phosgenite typically shows pale colors. This material is difficult to cut and too soft for jewe ...
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Phosphophyllite
Renowned for its delicate blue-green shades, phosphophyllite's beauty is enhanced by expert cutting. ...
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Pollucite
Colorless pollucites lack fire when cut and are usually small. However, this very rare cesium minera ...
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Powellite
An overview on Powellite Jewelry and Gems. Covers details and essential information on the physical ...
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Prehnite
Prehnite is popular as a cabochon material among hobbyists because of its lovely green and blue-gree ...
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Prosopite
Prosopite is usually a nondescript mineral with no gem significance. However, beautiful blue specime ...
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Proteus
A few almandine/pyrope garnets from the US will change with treatment into proteus garnets. In refle ...
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Proustite
Proustite crystals have magnificent red colors and good brilliance. Although facetable, they're too ...
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Pumpellyite
The gem variety of pumpellyite, chlorastrolite, is best known from the Lake Superior district of the ...
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Purpurite
Purpurite is too soft for jewelry wear and never transparent. Nevertheless, lapidaries have cut cabo ...
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Pyrargyrite
Deep red pyrargyrite occurs in a number of localities in well-formed but small crystals. However, fa ...
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Pyrite
Pyrite is more commonly known as fool's gold and is familiar to nearly every mineral collector. It h ...
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Pyrope Garnet
Pyrope always occurs in series with other garnet species. Common, dark red garnets are a mixture of ...
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Pyrophyllite
Pyrophyllite resembles talc in many ways and is indistinguishable by eye from soapstone. Chemical te ...
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Pyroxmangite
Pyroxmangite grains are rare, seldom clean enough to facet, and difficult to cut. However, when cut, ...
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Pyrrhotite
An overview on Pyrrhotite Jewelry and Gemstones. Covers details and essential information on the phy ...
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Quartz
An overview on Quartz Jewelry and Gemstones. Covers details and essential information on the physica ...
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Quartzite
Quartzite is a rock made up of tightly packed quartz grains. Sometimes, it contains small crystals t ...
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Realgar
Although this common arsenic sulfide mineral occurs worldwide, cut gem-quality realgar is extremely ...
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Red Beryl
Originally known as bixbite, red beryl is one of the rarest, most desirable, and most expensive gems ...
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Rhodizite
Rhodizite is tough enough to make an excellent jewelry stone. However, it's quite a rare mineral. Fa ...
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Rhodochrosite
Beautiful rose red to pink rhodochrosite crystals are popular with mineral collectors. Although very ...
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Rhodolite Garnet
Rhodolites are purplish red garnets, a blend between almandine and pyrope in composition. These dura ...
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Rhodonite
Ranging in color from pink to a fine rose red, rhodonite is a popular material for jewelry and decor ...
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Rose Quartz
A popular variety of colored quartz, rose quartz makes a durable jewelry stone. Although commonly ca ...
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Rubellite
Rubellites are tourmalines with reasonably saturated dark pink to red colors and medium to dark tone ...
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Ruby
One of the most popular traditional jewelry stones, ruby is exceptionally durable. Its colors — alwa ...
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Rutile
Though perhaps best known as inclusions within other gems, rutile crystals themselves can be faceted ...
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Saltwater Pearl
Although pearls are one of humanity's most ancient gems, natural undersea beds of pearl-producing oy ...
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Samarskite
Samarskite is a very heavy material from which lustrous black to brownish cabochons are sometimes cu ...
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Sanidine
Sanidine is a mineral of volcanic rocks, rarely considered a gem. While occasionally brown or yellow ...
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Sapphire
Few gems have held our attention over millennia as well as sapphire. The pure blue colors and excell ...
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Sapphirine
Sapphirines are durable but very rare gemstones. Although named after their typically sapphire-blue ...
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Sarcolite
Sarcolite is an extremely rare mineral. Tiny, colorless to "fleshy pink" gems have been cut only fro ...
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Scapolite
Although not well known, scapolite would make an attractive gem material for both jewelry enthusiast ...
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Scheelite
Large, faceted scheelites are among the most beautiful of all collector's gemstones. They occur in m ...
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Scorodite
With lovely colors and intense pleochroism, faceted scorodite is a prize for collectors of the rare ...
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Sellaite
An overview on Sellaite Jewelry and Gemstones. Covers details and essential information on the physi ...
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Senarmontite
Senarmontite is a rare mineral, restricted in occurrence to the presence of antimony sulfide ores. I ...
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Serandite
To date, only one locality — Mont St. Hilaire, Quebec, Canada — has produced facetable serandite. Th ...
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Serpentine
The gem material known as serpentine actually encompasses several related mineral species. For mille ...
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Shattuckite
Shattuckite is often mixed with quartz, and data often reported for properties may be erroneous. The ...
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Shortite
Shortite is an exceedingly rare, not overly attractive mineral. Cut gems are among the rarest of all ...
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Siderite
Siderite is difficult to cut, but this light brown collector's gem has yielded faceted pieces of gre ...
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Sillimanite
The fibrolite from Burma and Sri Lanka is well known to gem collectors, and highly prized because of ...
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Simpsonite
Simpsonite is an extremely rare gemstone. The material from Western Australia is bright yellow-orang ...
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Sinhalite
Long thought to be brown peridot, sinhalite was investigated in 1952 and found to be a new mineral. ...
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Smaltite
Smaltite is a collectors oddity, cut only as cabochons. It is seldom seen in collections since it is ...
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Smithsonite
Smithsonite occurs across the globe, but facetable crystals are extremely rare. These gems can show ...
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Smoky Quartz
Smoky quartz comes in every shade of brown, from a light tan to nearly black. This gem is known for ...
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Sodalite
Typically blue, durable, and easy to cut, sodalite is highly desired by hobbyists. Even stones that ...
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Sogdianite
Sogdianite is an extremely rare mineral, suitable for cabochons. The color is striking and the mater ...
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Spessartite Garnet
Usually orange to reddish brown, gem-quality spessartite or spessartine garnets are somewhat rare. H ...
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Sphalerite
Sphalerite occurs in many colors. With a dispersion over three times that of diamond and an adamanti ...
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Sphene (Titanite)
Sphene, also known as titanite, has rich body colors, strong trichroism, and a fire that exceeds dia ...
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Spinel
Spinel is an important gem historically because it has been confused with other gemstones, especiall ...
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Spodumene
Extraordinarily difficult to cut, spodumene has several colorful varieties, such as hiddenite and ku ...
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Spurrite
An attractive but uncommon mineral, spurrite has seldom been cut as a gemstone. However, it has the ...
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Star Sapphire
Star sapphire is a type of sapphire that displays asterism, a star-like optical effect.
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Staurolite
Staurolite crystals in opaque cross shapes are popular gemstones. However, this material is very rar ...
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Stibiotantalite
Rare stibiotantalite possesses an interesting mix of physical and optical properties that help disti ...
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Stichtite
Stichtite is not facetable, but the pink color is quite striking in cabochons. Cut stones are especi ...
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Stolzite
Stolzite is a rare mineral; much rarer than wulfenite and usually occurs in very minute crystals. Ho ...
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Strontianite
Strontianite is a collector's oddity, with no spectacular properties to recommend it. Colors are usu ...
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Sugilite
What is the color of sugilite? Grape jelly purple is a good description. More popular among consumer ...
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Sulfur (Sulphur)
Although sulfur is very abundant, facetable material is not. Sulfur is also enormously difficult to ...
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Sunstone
Sunstones contain hematite or goethite inclusions, which reflect light in parallel orientation and c ...
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Taaffeite
Taaffeite reacts to most gemological tests like mauve-colored spinel, but can be distinguished on th ...
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Talc
An overview on Talc Jewelry and Gemstones. Covers details and essential information on the physical ...
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Tantalite
Tantalite is too dark to be of use as a faceted gem but is sometimes cut as a collector curiosity, e ...
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Tanzanite (Zoisite)
Tanzanite has had a rapid rise to prominence among jewelers and gem enthusiasts. Although naturally ...
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Tektite
Tektite is a natural glass formed from the ejected debris of meteorite impacts. Though most pieces a ...
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Tephroite
Tephroite is generally reddish brown and barely translucent. However, it takes a good polish and is ...
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Thaumasite
For a long time, rare thaumasite crystals — pale, fragile, and with little to no fire — were interes ...
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Thomsonite
Thomsonite cabochons take a high polish but are somewhat brittle. These are especially lovely when a ...
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Tiger's Eye
Crocidolite, (blue asbestos,) alters to quartz, but while retaining its fibrous structure. This mate ...
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Topaz
The traditional November birthstone, topaz is a popular gem. Although frequently associated with gol ...
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Tourmaline
Tourmaline is a name applied to a family of related minerals with widely varying properties. Tourmal ...
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Tremolite
It is possible to misidentify tremolite, mistaking it for other amphiboles. Hexagonite is the rarest ...
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Triphylite (Tryphylite)
Triphylite is one of the world's rarest gems. The IGS had the extraordinary privilege of examining a ...
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Tsavorite Garnet
An emerald-green variety of grossular garnet, tsavorite is one of the most popular and expensive var ...
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Tugtupite
Gem collectors prize tugtupite, the "Reindeer Stone," for its rich colors and intense reaction to ul ...
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Turquoise
With striking sky blue to blue-green colors, turquoise has been prized by cultures all over the worl ...
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Ulexite
The fibrous material cuts interesting catseye cabochon gems, but they are curios only since they are ...
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Uvarovite Garnet
Always a dark, rich green color, uvarovite is one of the rarest members of the garnet family. Usuall ...
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Vanadinite
A faceted vanadinite may be considered a tremendous rarity. Fewer than ten such gems may have been c ...
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Variscite
With beautiful green to blue-green colors and interesting patterns, variscite is a popular hobbyist ...
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Villiaumite
A little-known and rare collector's gemstone, villiaumite is very difficult to facet. Its toxicity a ...
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Vivianite
Vivianite is so fragile and soft, any faceted gems would be difficult to handle safely, let alone we ...
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Väyrynenite
Väyrynenite is a very rare mineral. Crystals as well as faceted gemstones in reddish, pinkish, and o ...
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Wardite
Wardite is another of the many phosphates that have been cut by collectors. It is pale colored and n ...
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Wavellite
Wavellite is a very attractive mineral, well-known to collectors. Its radial aggregate crystal clust ...
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Weloganite
Truly a collector's gem, weloganite is very rare and seldom cut. This stone can show pale yellow col ...
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Whewellite
Seldom seen even in mineral collections, whewellite is very rarely faceted. It's mostly desired as a ...
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Wilkeite
An overview on Wilkeite Jewelry and Gemstones. Covers details and essential information on the physi ...
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Willemite
Willemite is prized for its intense green fluorescence. Too fragile for jewelry use, faceted specime ...
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Witherite
Easy to cut but too soft and fragile for jewelry, a faceted witherite would make an unusual addition ...
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Wollastonite
Interesting cabochons have been cut from wollastonite, especially from the fibrous material (which y ...
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Wulfenite
Although aesthetically magnificent wulfenite crystals are often too thin, soft, and sensitive to cut ...
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Xonotlite
Xonotlite is strong and can take a good polish. However, these gems are extremely rare, both as a sp ...
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Yugawaralite
Yugawaralite is a very rare colorless to pinkish zeolite mineral. Little facetable material exists, ...
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Zektzerite
Small, cuttable crystals of very rare zektzerite are found only in a mountainous location in Washing ...
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Zincite
Zincite is a very rare mineral. It's also difficult to cut, which makes faceted zincite one of the r ...
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Zircon
Don't be confused by the name. Zircon is a natural, magnificent, and underrated gemstone that has be ...
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Zunyite
An overview on Zunyite Jewelry and Gemstones. Covers details and essential information on the physic ...
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Source: https://www.gemsociety.org/gemstone-encyclopedia/
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