Examination of samples of faceted "Ocean green" topaz reveals that this material has been irradiated in a nuclear reactor.
Read MoreFrom the Summer 1991 issue of Gems & Gemmology, a summary of important gemmology-related articles published in other journals.
Read MoreLarge quantities of colourless topaz are currently being treated by gamma irradiation to turn them blue.
Read MoreA review of the various techniques in use today to change colourless topaz to a variety of hues.
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