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GIA Notifies the Trade of Undisclosed Diamond Treatment

May 12, 2015 12:31 PM   By Jeff Miller
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RAPAPORT... The Gemological Institute of America (GIA) reported that approximately 500 colorless to near-colorless diamonds that were submitted primarily to GIA’s grading laboratory in Ramat Gan, Israel, were potentially subjected to an undisclosed temporary treatment.

GIA believes that the treatment temporarily masks the body color of the diamond, resulting in a color grade that can be up to three grades higher than its actual grade. The GIA, therefore, terminated client agreements with the companies that submitted the diamonds in question and has notified appropriate trade bodies.

The report numbers of the potentially treated stones are posted on GIA’s website ( Anyone who has purchased or has access to any of these diamonds is asked to submit them to any GIA lab for a no-cost, expedited review. 


Tags: diamond, diamonds, disclosure, gemstone, GIA, grading, Jeff Miller, treatment
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