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1) I have an unidentified colourless crystal.  Tried to check that crystal with presidium gem tester and it showed that it's not a diamond.  Now we got winter, and the temperature has fallen to 22 centigrade, now that crystal showing as a diamond. What should I take it diamond or not?

2) I have an identified diamond rough it shows as a diamond with tester anytime in summer and winter. Even if i heat that diamond rough with a candle (50 to 60 centigrade), it still shows as a diamond with the tester.

Let me know your opinions.
asked Dec 30, 2018 by Pride (960 points)

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First off, I would not subject any rock to heat unless I knew what I was about. Heat treating can change a stone's color and or damage it. Amethyst is treated, citrine imposter is made from less rare material getting heated.. There are other ways. The easiest is having a lapidary test it. Crystalline structure is very indicative.
answered Jan 4 by Weasel (55,970 points)

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