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CIBJO
CIBJO Calls for Synthetics Treatment Disclosure
The World Jewellery Confederation (CIBJO) has specified theneed to disclose treatments when it comes to both natural and lab-grown diamonds. Sellers must make the disclosure clearly, both at the time of sale and before, the...
Polished Markets Mar 17, 2019 Rapaport News
Irradiated melee
GIA Spots CVD Stone in Parcel of Treated Melee
In a rare case, the Gemological Institute of America (GIA)has discovered an irradiated chemical vapor deposition (CVD) diamond in a batch of natural melee aclient had submitted for testing. The GIA’s Tokyo laboratory found the 0.007-carat, irradiatedgreen-blue...
Polished Markets Feb 10, 2019 Rapaport News
GIA 150
GIA Spots Treatment Fraud with 6ct. Polished
The Gemological Institute of America (GIA) has uncovered atreated diamond carrying a false inscription that fraudsters had apparentlycreated to make the stone appear untreated. Swindlers appear to have carefully selected a grading reportfor an untreated diamond...
Polished Markets May 30, 2018 Rapaport News
GIA
GIA Notifies the Trade of Undisclosed Diamond Treatment
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...
Polished Markets May 12, 2015 Jeff Miller
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