Heat Treatment Effects on Yellow Sapphire

January 3, 2022

Heating is the most common treatment to improve the color and/or clarity of corundum. Yet the identification of heat treatment in a yellow sapphire is challenging for gemologists. Why? 

Learn more in this detailed look by Ungkhana Atikarnsakul and John L. Emmett in their article published in Gems & Gemology by GIA. 

Read the complete article here

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