Frequently Asked Questions

Does GIA grade tourmaline?


GIA evaluates tourmaline but does not grade it. A GIA Colored Stone Identification Report assesses the characteristics of any polished, rough, mounted or loose material (weight, measurements, shape, cutting style and color); identifies whether it is natural or laboratory-grown; and names any detectable treatments. Paraíba tourmaline can be submitted for a Colored Stone Identification & Origin Report.

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