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GIA's Gübelin Gem Project: Various Gems, Taaffeite - Zoisite

Among the collection assembled by Dr Edward Gübelin are a number of uncommon gemstones from many worldwide localities.

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Multi-colored gems are superimposed on an image of glacier peaks.
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Gems and Minerals from the Sub-Arctic

Circumnavigate the boreal reaches of the globe to explore gems from polar regions.

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Worker attaching wax forms
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Shenzhen: The Frontier of China’s Gem and Jewellery Industry

All jewellery professionals are familiar with the city of Shenzhen, a global jewellery manufacturing centre and a leader of China’s fast-growing gem and jewellery industry. Join the GIA team as we tour the city and discover more about its leading jewellery brands.

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Abstracts; Summer 1991

From the Summer 1991 issue of Gems & Gemmology, a summary of important gemmology-related articles published in other journals.

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An Update on Imperial Topaz from the Capao Mine, Minas Gerais, Brazil

The Capao mine is one of the oldest and most productive fully mechanised Imperial topaz mines in the historic Ouro Preto area of Minas Gerais, Brazil.

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Pink Topaz from Pakistan

Pakistan has begun to produce fine gem-quality pink topaz.

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Topaz, Aquamarine and Other Beryls from Klein Spitzkoppe, Namibia

This article presents, for the first time, both gemmological and geologic information on topaz, aquamarine and other beryls from miarolitic pegmatites at Namibia’s historic Klein Spitzkoppe mineral locality.

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Irradiated Topaz and Radioactivity

Large quantities of colourless topaz are currently being treated by gamma irradiation to turn them blue.

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The Capão Topaz deposit, Ouro Preto, Minas Gerais, Brazil

This article examines the history of the Ouro Preto district as well as the geology of the area and occurrence of the topaz.

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Sri Lanka: The Gem Island

An overview of the many types of gem-quality material, and its inclusions, currently found in Sri Lanka.

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