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Article
Montana’s Gem Mountain Sapphire Mine: Sharing the Excitement of Mining with the Public

Join a GIA field team on an expedition to Gem Mountain, Montana, and witness the rarely seen sapphire heat treatment process and tourists passionately searching for treasures to turn into cherished jewelry.

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Article
Fall 2015 G&G: Trapiche Emeralds, Synthetic Diamonds and a Large Diamond Source

G&G Brief presents an overview of the content of the Fall 2015 issue of Gems & Gemology.

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Color zoning in amethyst from Boudi, Morocco
Amethyst from Boudi, Morocco

An introduction to Moroccan amethyst, which features distinctive color zoning and inclusions.

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 Large open mussel shell with pink interior
Article
Freshwater Pearling in Tennessee

Natural pearl identification is one of the critical problems in pearl research. The DNA study of pearly mollusks and oysters facilitates solving this problem. To fulfill this goal, GIA sent a group from both research and education to Tennessee to sample the freshwater mollusks for DNA bar coding. Come with us to Camden, Tennessee, to see how we dive for pearly shells.

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Three Occurrences of Oregon Sunstone

Chronicles a visit to the high desert of eastern Oregon to examine commercial sources of this natural copper-bearing feldspar.

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Pearls, shells, and jewelry on table
Article
The Lure of American Freshwater Pearls: Revisiting the Latendresse Family

John Latendresse is known as the father of American cultured pearls. He was also a great natural pearl collector and left his family a remarkable natural pearl collection. The Latendresse family is well recognized in the American pearl industry and has long supported GIA pearl research. Come with us to revisit this family and their pearl collection.

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Miners use shovels and sluicing equipment to search for diamonds near the Vaal River in South Africa.
Article
Historical Reading: The Diamond Fields of South Africa: Part 2 (1893-2014)

Within a few years of their discovery, the diamonds deposits of South Africa produced more diamonds than what had come from India in two millennia.

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Four people seated in front of screen. One woman standing the far right.
Article
RJC Panel Explores Colored Gemstone Issues at Baselworld 2017

The Responsible Jewellery Council holds a discussion on the challenges, issues of certifying colored gem firms at the 2017 Baselworld fair.

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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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Tourmaline Crystals
Article
Romancing the Source: Cruzeiro Mine, Brazil

Accompany GIA field gemologists on a true gemstone mining adventure to Brazil’s Cruzeiro tourmaline mine. Very few colored stone sources can provide the same thrill as that inspired by this mine, which produces eight tons of tourmaline annually.

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