27-2-2020
The Gemological Science International’s (GSI) Mumbai laboratory found a laser drill channel on a HTHP lab-grown diamond, a treatment generally only found in natural stones to remove black inclusions and enhance clarity.
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.
GSI chief information officer Nick Del Re said: “Diamond growing technology continues to improve and growers are trying to mimic natural diamonds in every possible way.” A hasty examination could have led to a conclusion that the diamond is natural backed by the existence of a laser-drill channel, as there is a common misconception that a diamond can be identified as natural diamond based on inclusions. GSI stresses the importance of using proper processes, equipment and expertise when identifying diamonds.
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