The Radioactive Decay Pattern of Blue Topaz Treated by Neutron Irradiation
Jian Zhang, Taijin Lu, Manjun Wang, and Hua Chen
A systematic study of 15 neutron-irradiated blue topaz samples was conducted using high-purity germanium (HPGe) digital gamma-ray spectroscopy.
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Reactor-Irradiated Green Topaz
Charles E. Ashbaugh III and James E. Shigley, June 1, 1993
Examination of samples of faceted "Ocean green" topaz reveals that this material has been irradiated in a nuclear reactor.
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Gemstone Durability: Design to Display
Deborah Dupont Martin, June 1, 1987
A treatise on the design, display, care and repair of fine gemstones.
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The Rutilated Topaz Misnomer
John I. Koivula, June 1, 1987
An examination of so-called "rutilated topaz."
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Thermal Alteration of Inclusions in "Rutilated" Topaz
Robert C. Kammerling and John I. Koivula, September 1, 1989
Faceted colourless topaz containing acicular inclusions has been offered for sale as "rutilated" topaz.
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Colouring of Topaz by Coating and Diffusion Processes: An X-Ray Photoemission Study of What Happens Beneath the Surface
Harald Gabasch, Frederik Klauser, Erminald Bertel, and Thomas Rauch
Surface-treated topaz has become a viable alternative to topaz coloured by irradiation.
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An Update on Imperial Topaz from the Capao Mine, Minas Gerais, Brazil
Daniel A. Sauer, Alice S. Keller, December 1, 1996
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
James E. Shigley and Anthony R. Kamp, June 1, 1984
A survey of the current gemmological knowledge of pegmatites, including the gem varieties aquamarine, tourmaline and topaz.
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Pink Topaz from Pakistan
Edward Gübelin, Giorgio Graziani, September 1, 1986
Pakistan has begun to produce fine gem-quality pink topaz.
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Topaz, Aquamarine and Other Beryls from Klein Spitzkoppe, Namibia
Bruce Cairncross, Ian C. Campbell, June 1, 1998
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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