Examination of samples of faceted "Ocean green" topaz reveals that this material has been irradiated in a nuclear reactor.
Read MoreA treatise on the design, display, care and repair of fine gemstones.
Read MoreFaceted colourless topaz containing acicular inclusions has been offered for sale as "rutilated" topaz.
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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