Agate to Zircon

Agate is a variety of chalcedony found in many different colors and degrees of translucency. There are several varieties of ...
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Alabaster Carving on Onyx Background. Alabaster is a name used for gypsum and calcite but has also been used to indicate selenite ...
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Alexandrite is a variety of chrysoberyl with a distinct change of color when viewed in incandescent and fluorescent light. The ...
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These deep purplish-red garnets were often featured in Victorian Jewelry. When they are cut en cabochon they are referred to as "carbuncles." For more ...
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Amazonite, a variety of the microcline series of the feldspar group, gets its name from the Amazon River. A gridlike structure visible in ...
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In the forest primeval, a creature calls…Its echo is heard for millions of years.Frozen in time; the drama unfolds--A death ...
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Amethyst is the most coveted member of the quartz family. It can be found in shades ranging from a very ...
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Ametrine is a variety of quartz consisting of both amethyst and citrine with zones of both purple and yellow. Most ...
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The name, Andalusite, is an homage to the city of Andalusia, Spain. Gem quality examples of this mineral species are ...
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Andradite Garnet var. Demantoid ...
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Gems & Gemology: The Quarterly Journal of the Gemological Institute of AmericaApatiteSummer 1962, Cat’s-Eye Apatite, p. 315, 2pp.Summer 1963, Yellow Cat’s-Eye ...
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Aquamarine is the blue variety of the mineral beryl. Most natural aquamarine is a pale bluish green, which was the ...
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Aragonite is a naturally occurring crystal form of calcium carbonate and is a precipitate from salt and freshwater conditions. One ...
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Aventurine Quartz Rough ...
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Gems & Gemology: The Quarterly Journal of the Gemological Institute of America. Azurite: Fall 1960, Azurite and its Absorption Spectrum, p ...
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Sources Gem Reference Guide, Los Angeles: Gemological Institute of America, 1988. Pp. 22-23. Schumann, Walter. Gemstones of the World, New ...
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Gems & Gemology: The Quarterly Journal of the Gemological Institute of America. Benitoite: Summer 1953, Benitoite, by Ehrmann, p. 317, 1p ...
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Beryl is a beryllium aluminum silicate that occurs in every color of the rainbow but is colorless in pure form; ...
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The tradition of birthstones, or birthday stones, is a Polish 18th-century popularization¹ of accumulated superstition and tradition which were ...
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Biwa pearls are a cultured pearl produced in a freshwater mussel native to Lake Biwa, Japan. Considered to be a non-nucleated pearl, they are ...
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Who on this world of ours his eyesIn Aries opens shall we be wiseIf always on his hand there liesA ...
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Cairngorm is the name given to a citrine quartz variety with an amber or brown color traditionally mined in the Cairngorm Mountains in ...
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Calcareous concretions are pearl-like growths produced in mollusks that lack nacre. While still composed of calcite and aragonite, the crystals are much coarser. Some ...
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Sources Gem Reference Guide, Los Angeles: Gemological Institute of America, 1988. Pp. 41-43. Schumann, Walter. Gemstones of the World, New ...
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Calcium carbonate is a primary component of the shells of marine mollusks and pearls. The outer shells of mollusks are ...
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Carbon is a chemical element on the periodic table. Carbon is the 15th most abundant element in the earth's crust ...
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A large almandine garnet that is cut en cabochon. These deep purplish-red garnets were popular in Victorian jewelry. Victorian Garnet and Diamond Pendant ...
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Carnelian (or cornelian) is the translucent red variety of chalcedony which in its turn is a form of cryptocrystalline quartz. It's been known and used since ...
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Cave pearls are not actually pearls, they are a calcareous concretion occurring in subterranean limestone caves. While they bear a resemblance to pearls, ...
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Chalcedony is cryptocrystalline quartz. It is semitransparent to opaque and, depending on its color, chalcedony is further divided into several varieties. HistoryAll ...
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Chlorastrolite. Sources Gem Reference Guide, Los Angeles: Gemological Institute of America, 1988. Pp. 49-50 ...
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Chrysoberyl is among the most brilliant of gems and its hardness is only surpassed by diamonds and corundum. The name ...
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Chrysocolla is an intense blue-green to light blue variety of chalcedony. It can be translucent to semitransparent and is usually cut en cabochon. Tumbled ...
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Chrysoprase is the name reserved for bright green cryptocrystalline quartz. It is a subvariety of chalcedony and owes its beautiful green color to the ...
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French Japonesque Cinnabar, Diamond and Onyx Jabot Pin.  Online Texts on Cinnabar Some Cinnabar Deposits in Western Nevada by Knopf ...
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Citrine is a yellow or golden variety of quartz, colored with iron. Natural citrine is relatively rare, occurring in Brazil, ...
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Colored stones are all gemstones that are not a diamond. The term is used as a general catch-all for gemstones.Georgian Style ...
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A conch pearl is not technically a pearl at all, but a white or pink (sometimes brown or yellow), non-nacreous, product of ...
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 A dark organic substance secreted by some invertebrate animal life including coral polyps and pearl producing mollusks. Conchiolin is the ...
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Copal is a fossilized organic resin. This amorphous yellow to brownish material is often confused with amber, but amber is much ...
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Coral is one of a very few organic gemstones. It consists of a mass of skeletons of tiny marine invertebrates ...
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DefinitionThe mineralogical name for Al2O3, the corundum family encompasses the gem varieties sapphire and ruby. It crystallizes in the trigonal structure and is ...
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At the end of the reign of Nicholas I, Emperor of Russia, and the beginning of the reign of Tsar ...
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Diamonds are valued for their incredible brilliance and hardness. Diamonds are chemically pure carbon, identical to the graphite used for ...
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Grossular Diopside. Photo Courtesy of Rob Lavinsky, iRocks.com – CC-BY-SA-3.0 ...
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A surface covered with small projecting crystals, usually lining the sides of a cavity ...
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Emerald is the green variety of the mineral beryl, owing its vibrant color to a trace amount of chromium and ...
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Emeralds from Habachtal / Austria in Jewelry and arts by Nikolaus B.G. Lackner  IntroductionPicture of Trapeze Cut Habachtal Emerald Placed on ...
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