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

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

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Tourmaline Crystals
Article
Romancing the Source: Cruzeiro Mine, Brazil

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

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Worker attaching wax forms
Article
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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Cruzeiro mine
Article
From Brazil to China: The Journey of Rubellite Tourmaline

After documenting tourmaline production at the famous Cruzeiro mine in Brazil, GIA takes you to China, where you can witness the cutting of these stones for entry into the hottest tourmaline market in the world.

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Expedition to the Cruzeiro Tourmaline Mine in Minas Gerais
Article
Expedition to the Cruzeiro Tourmaline Mine in Minas Gerais, Brazil

Journey with us to Brazil for a visit to one of the world’s most prolific tourmaline mines. You’ll also hear a highly captivating story of family success through perseverance.

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Solution-Generated Pink Colour Surrounding Growth Tubes and Cracks in Blue to Blue-Green Copper-Bearing Tourmalines
Solution-Generated Pink Colour Surrounding Growth Tubes and Cracks in Blue to Blue-Green Copper-Bearing Tourmalines from Mozambique

Several transparent, faceted, blue to blue-green copper-bearing tourmalines containing growth tubes and cracks surrounded by sleeves of pink colour were examined for this report.

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Mt. Mica: a renaissance in Maine’s gem tourmaline production

The Mt. Mica area in southwestern Maine has been mined for tourmaline and other pegmatite gems since the 1820s.

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Copper and tenorite inclusions in cuprian-elbaite tourmaline from Paraíba, Brazil

Inclusions of native copper and tenorite (CuO) were found in greyish-green elbaite from São José da Batalha, Paraíba, Brazil.

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An Update on “Paraíba” Tourmaline from Brazil

“Paraíba” tourmalines continue to be recovered in small amounts from north-eastern Brazil.

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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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