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

    0  Views: 997 Answers: 1 Posted: 10 years ago

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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



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