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.
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.
Reactor-Irradiated Green Topaz
Examination of samples of faceted "Ocean green" topaz reveals that this material has been irradiated in a nuclear reactor.
Thermal Alteration of Inclusions in "Rutilated" Topaz
Faceted colourless topaz containing acicular inclusions has been offered for sale as "rutilated" topaz.
"Modern" Jewellery: Retro to Abstract
A review of mid-20th century jewellery styles.
Gem-Bearing Pegmatites: A Review
A survey of the current gemmological knowledge of pegmatites, including the gem varieties aquamarine, tourmaline and topaz.
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.
Sri Lanka: The Gem Island
An overview of the many types of gem-quality material, and its inclusions, currently found in Sri Lanka.