The Gemological Science International’s (GSI) has released a caution of “treatment imitation” in lab-grown diamonds following a discovery at its Mumbai laboratory.

The team at GSI identified a HTHP lab-grown diamond with what appeared to be a laser drilled channel.

GSI researchers and scientists observed and studied this diamond since it would be highly unusual to laser drill a lab-grown stone. Upon closer examination, the ‘laser drill channel’ was found to be a typical HTHP inclusion that was cut open from top and pavilion. After this, the content of the inclusion was acid bleached out, while some residue was still present. The remnants of the inclusion have a strong resemblance to a laser drill treatment – this treatment is generally used to “clean out” black inclusions and enhance the appearance of a diamond.

The lab-grown stone discovered at GSI.

It is a common misconception that a diamond can be identified as natural or lab-grown based on inclusions. In this specific case, a hasty and inaccurate conclusion could have been made that the diamond is natural, with the appearance of what seems to be a laser drill channel, since there are no recorded cases of lab-grown diamonds with this treatment, nor would it currently make sense to laser drill these diamonds.

“Diamond growing technology continues to improve and growers are trying to mimic natural diamonds in every possible way,” reports GSI’s chief information officer. Nick DelRe.

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

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Editor, Professional Jeweller