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

    0  Views: 1344 Answers: 1 Posted: 14 years ago

    1 Answer

    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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