site:www.gia.edu

Gemological Institute of America    

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Established in 1931, the Gemological Institute of America (GIA) is the world’s foremost authority on diamonds, colored stones, and pearls. A …

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Frequently asked questions

Q:
What does heat treated mean?
A:
This means the material has undergone some type of heating process in order to alter or improve its appearance — most commonly its color.
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