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    3. What does a heat treatment do to a tourmaline gem stone?
    What does a heat treatment do to a tourmaline gem stone?

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    0  Views: 1227 Answers: 1 Posted: 13 years ago
    Tags: jewelry gem stones
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      Green tourmaline is often heated to lighten color in over saturated gems, like those commonly seen in Brazil. Other tourmalines are heated to alter one of the dichroic colors.


      from:  http://www.moregems.com/heat_treatment_of_gems

      13 years ago. Rating: 0
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