Around 500 colourless to near-colourless diamonds submitted primarily to the GIA’s grading laboratory in Ramat Gan, Isreal, may have been subjected to an undisclosed temporary treatment according to the organization.
The GIA believes that the treatment temporarily masks the body color of the diamond, resulting in a colour grade that can be up to three grades higher than its actual grade.
The Institute has 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.