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GIA HPHT
Undisclosed Green Synthetics Raise GIA Eyebrows
Twenty-five undisclosed lab-grown diamonds have turned up atthe Gemological Institute of America (GIA) — including several with a raregreenish color. The GIA’s lab in Carlsbad, California, recently received thestones — weighing from 0.46 to 0.52 carats — for...
Technology May 26, 2019 Rapaport News
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
GIA Sheds Light on De Beers’ Synthetics
Two white lab-grown diamonds from De Beers’ Lightbox brandhave G color and VS clarity, the Gemological Institute of America (GIA) saidafter examining the stones. Lightbox doesn’t offer grading reports for its products, andhadn’t previously...
Polished Markets Feb 07, 2019 Joshua Freedman
GIA mistaken
‘Lab-Grown’ Diamond Turns Out to Be Natural
A client of the Gemological Institute of America (GIA)wrongly submitted a natural diamond as a lab-grown stone, the organizationsaid.The GIA’s Carlsbad laboratory recently received the round brilliant,2.23-carat, D-color diamond, which the customer had sent in for asynthetic-diamond...
Polished Markets Feb 06, 2019 Rapaport News
Diamond swapping
Trade ‘Blind to Diamond-Swapping Threat’
Diamond dealers are failing to protect themselves against stone-swapping,and are instead waiting until an expensive loss occurs before taking action, equipmentsuppliers have warned. The switching of natural diamonds with synthetics or otherlower-value goods is a common...
Technology Aug 15, 2018 Joshua Freedman
GIA 150
GIA to Hold Synthetics Detection Seminars
The Gemological Institute of America (GIA) will offer aseries of seminars this year on advanced detection of lab-grown stones. The courses, which will be taught by GIA research scientistsand classroom instructors, will combine lectures with practical...
Polished Markets Jun 06, 2018 Rapaport News
IIDGR
Labs Refute Claims HPHT Escaping Detection
Major gemological laboratories have rebuffed claims that detection machines are failing to spot synthetic diamonds that have undergone irradiation.In a trade alert last week, Diamond Services argued that the treatment, generally used...
Technology Apr 25, 2018 Leah Meirovich
GIA synthetic inscription forgery
GIA Finds Synthetic Diamond with Forged Inscription
Fraudsters forged a Gemological Institute of America (GIA)inscription on a synthetic diamond to make it appear that the stone was thetrue bearer of a natural-diamond grading report, the institute said.The engraving on the polished diamond’s girdle contained a genuineGIA report...
Technology Nov 13, 2017 Rapaport News
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