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Field gemologists sort through gem gravel in Myanmar
Field Gemology: Building a Research Collection and Understanding the Development of Gem Deposits

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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Sri Lanka: Expedition to the Island of Jewels
Sri Lanka: Expedition to the Island of Jewels

Offers a firsthand look at Sri Lanka’s mining, cutting, jewelry manufacturing, and retail sectors, where tradition and innovation converge.

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Variety of rubies from northern Mozambique, 2009–2010
A Decade of Ruby from Mozambique: A Review

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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GIA field expedition team in Ethiopia
Land of Origins: A Gemological Expedition to Ethiopia

Documents a visit to the sapphire, opal, and emerald mining and trading areas of Ethiopia.

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Montana sapphires after two rounds of heating
Big Sky Country Sapphire: Visiting Montana’s Alluvial Deposits

Documents a visit to the upper Missouri River and Rock Creek sapphire mining areas.

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El Pulpito, the landmark overlooking the Chivor mine
In Rainier’s Footsteps: Journey to the Chivor Emerald Mine

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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Underground opal mining in Koroit
Splendor in the Outback: A Visit to Australia’s Opal Fields

Documents a trip to the renowned opal fields of Lightning Ridge, Koroit, Yowah, and Quilpie.

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GIA team at Montepuez ruby deposit
Mozambique: A Ruby Discovery for the 21st Century

Explores the geology, production, and yield of the world’s most commercially important ruby deposit.

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Madagascar’s Zahamena National Park
Article
GIA Field Gemologist Documents Madagascar Ruby Rush

Join GIA’s recent field expedition to the ruby rush in Madagascar’s Zahamena National Park.

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Exploring Zambia’s Emerald Mines
Article
GIA Field Gemologists Visit Zambia’s Emerald Mines

Go onsite to Zambia’s emerald mines with GIA’s field gemology team.

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