GSI CAUTIONS OF “TREATMENT IMITATION” IN LAB GROWN DIAMONDS

Recently, Gemological Science International’s (GSI) Mumbailaboratory identified HTHP lab-grown diamond with what appeared to be a laser-drilledchannel. GSI researchers and scientists observed and studied this diamond sinceit would be highly unusual to laser drill a lab-grown diamond. Upon closerexamination, the “laser drill channel” was found to be a typical HTHP inclusionthat was cut open from top and pavilion. After this, the content of theinclusion was acid bleached out, while some residue was still present. Theremnants of the inclusion have a strong resemblance to a laser drill treatment– this treatment is generally used to “clean out” black inclusions and enhancethe appearance of a diamond.

It is a common misconception that a diamond can be identified asnatural or lab-grown based on inclusions as the claim was made recently on GoodMorning America Investigates. In this specific case, a hasty and inaccurateconclusion could have been made that the diamond is natural, with theappearance of what seems to be a laser drill channel since there are norecorded cases of lab-grown diamonds with this treatment, nor would it currentlymake sense to laser drill these diamonds.

“Diamond growing technology continues to improve and growers are trying to mimic natural diamonds in every possible way,” said, Nick Del Re, GSI’s Chief Information Officer.

GSI stresses the importance of using proper processes,equipment, and expertise when identifying diamonds. GSI’s research departmentcontinues to conduct advanced testing on lab-grown and identification.