2.97 ct. Ceylon Sapphire
In the final installment of our series on how to evaluate the color of blue sapphires, we examine various ways to choose color, including personal preference, grading, science, and market price. The most controversial issue is whether or not the sapphire has been heat treated. We briefly review the history of heat treatments of sapphire and ruby, with special emphasis on the highly successful heat treatment of Geuda sapphire and its impact on the gem trade. Also mentioned are surface diffusion, beryllium diffusion, and glass filling. We end with a discussion of how treatments effect the price of sapphire.
james l. sweaney cga fga. gg
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