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Gemstone.org - International Colored Gemstone Association

Buy Gemstones Online. Loose Semi-Precious and Precious Stones: Sapphire, Spinel, Topaz, Garnet, Tourmaline, Opal, Emerald, Ruby, Amethyst and Birthstones

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The Gemological Institute of America, GIA, is the world

An interactive reference guide to rocks, minerals, and gemstones.

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Geology and Earth Science current events, news, articles, dictionary, satellite images, career information, reference maps, and more.

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