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.