Press release

GIA Notifies Trade of Potential Undisclosed Diamond Treatment

CARLSBAD, Calif. – 12 May 2015 – Approximately 500 colourless to near-colourless diamonds 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 colour 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. 
For press inquiries, please contact Stephen Morisseau at or +1 760-603-4411.

About GIA

An independent nonprofit organisation, GIA (Gemological Institute of America), established in 1931, is recognised as the world’s foremost authority in gemology. GIA invented the famous 4Cs of Colour, Clarity, Cut and Carat Weight in the early 1950s and in 1953, created the International Diamond Grading System™ which, today, is recognised by virtually every professional jeweller in the world.
Through research, education, gemmological laboratory services, and instrument development, the Institute is dedicated to ensuring the public trust in gems and jewellery by upholding the highest standards of integrity, academics, science and professionalism.