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Reactor-Irradiated Green Topaz

Examination of samples of faceted "Ocean green" topaz reveals that this material has been irradiated in a nuclear reactor.

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Thermal Alteration of Inclusions in "Rutilated" Topaz

Faceted colourless topaz containing acicular inclusions has been offered for sale as "rutilated" topaz.

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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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Gem-Bearing Pegmatites: A Review

A survey of the current gemmological knowledge of pegmatites, including the gem varieties aquamarine, tourmaline and 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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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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"Modern" Jewellery: Retro to Abstract

A review of mid-20th century jewellery styles.

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