Natural TOPAZES (One Pair) - Origin Brazil - Color Swiss Blue - 6.00 cts - Pure VS1 - Dimensions 13.95 x 6.94 x 4.34 mm - Size Marquise - Untreated - CGT CERTIFICATE (To be multiplied by 2) When a white or colourless Topaz is irradiated (by gamma rays or accelerated electrons) then heated, it becomes permanently blue. Sky blue is the easiest colour to obtain, followed by Swiss blue, London blue and royal blue.
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