With more than 90 field expeditions on six continents since 2008, GIA has accumulated over 22,000 colored stone reference samples. This extensive collection of colored stones with known origins supports GIA’s research on geographic origin determination.
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Offers a firsthand look at Sri Lanka’s mining, cutting, jewelry manufacturing, and retail sectors, where tradition and innovation converge.
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Reviews the mining history, market impact, and properties of ruby from northern Mozambique near Montepuez, now the world’s most productive source.
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Documents a visit to the sapphire, opal, and emerald mining and trading areas of Ethiopia.
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Documents a visit to the upper Missouri River and Rock Creek sapphire mining areas.
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Chronicles the famed emerald source through the adventures of Peter W. Rainier, who directed the mine from 1926 to 1931 and restored its former glory.
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Documents a trip to the renowned opal fields of Lightning Ridge, Koroit, Yowah, and Quilpie.
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Explores the geology, production, and yield of the world’s most commercially important ruby deposit.
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Join GIA’s recent field expedition to the ruby rush in Madagascar’s Zahamena National Park.
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Go onsite to Zambia’s emerald mines with GIA’s field gemology team.
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