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 Hand holding tube-shaped boulder opal
Article
Queensland Opal Fields: Home of the Unique Australian Boulder Opal

Boulder opal is becoming more and more popular. Australia’s central Queensland is the home of more than a dozen of sources of this stone. Come with GIA field gemologists to find out more about this unique gem.

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Sawing bangle blanks from jadeite slabs
Article
Jadeite Manufacturing and Trading Hubs in Guangdong, China

Join a GIA team on a visit to the bustling jadeite trading centers of Guangdong Province, China. You'll observe a market understood by few Westerners, as industry leaders explain the intricate details of a gemstone that's also an integral part of the culture.

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Close-up of high-quality Shan Zi jadeite carving
Article
The Spirit of Jadeite Carving

During an expedition to China, a GIA team was introduced to the largest jadeite boulder being carved. This amazing blend of nature’s beauty and man’s artistry is an ongoing project to which master artists have devoted years of their lives.

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Colombian independent miners
Colombian Emerald Industry: Winds of Change

A firsthand look at Colombia’s emerald mines and the cutting and trading industry in Bogotá.

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Brazilian Diamonds: A Historical and Recent Perspective

Recounts the history, geology, and notable localities of diamond mining in Brazil, and outlines plans for future diamond production.

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Jaipur, India: The Global Gem and Jewelry Power of the Pink City

Examines Jaipur’s role as a colored stone cutting and jewelry manufacturing center, with profiles of 17 companies and their factory, trading, and retail operations.

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Ruby-bearing gravel bed in Mugloto.
Update on Gemstone Mining in Northern Mozambique

Recounts an expedition to Mozambique’s important deposits of ruby, spinel, and tourmaline, which have yet to be fully explored.

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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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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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Rough Diamond Auctions: Sweeping Changes In Pricing and Distribution

Examines the growing percentage of rough diamonds being sold through auctions, a shift that has caused price volatility while opening up supply to more manufacturers and dealers.

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