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