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