amethysts have no.
(7) Checking with a Magnifying Glass:
Checking the crystal with a 10-times magnifying glass, in which if bubbles could be found, it can be judged basically as a false one.
(8) Checking with Hairs:
Putting the crystal jewelry on a hair, in which if a double shadow of the hair could be seen through your naked eyes, the crystal can be judged as a true one for natural crystal embodies with the character of birefringence namely double refraction.
(9) Detecting by a Thermal Conductivity Analyzer:
When checking the natural crystal with a thermal conductivity analyzer regulated to its green 4, the instrument’s indicative frame will rise to the yellow 2, while using it to detect false ones there won’t show any rising. When the detecting area of the checked natural crystal added, the analyzer’s indicative degree will rise to yellow 1.
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