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Sanctions imposed against ALROSA only resulted in the smaller gem and near-gem quality goods outperforming other categories in recent months, according to an independent diamond analyst Paul Zimnisky. He told Rough&Polished’s Mathew Nyaungwa in an exclusive...

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Most people see great potential in the growth of LGD jewelry market

Currently Wayne Wang-Wang Yichun is the General Manager, LUSANT - Incubation Project Management Department of Yuyuan Jewelry Co., Ltd. He was the General Manager of Shanghai Yuyuan Jewelry Co., Ltd - A Fosun Group Company; and General Manager of international...

20 june 2022

De Beers sees good potential for exploration activities in Angola

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Ali Pastorini: The jewelry consumer does not evaluate the brand only by price

Ali Pastorini is the co-owner of Del Lima Jewelry and President of Mujeres Brillantes, an association that brings together more than 1,000 women working in the gold and diamond trading sector, mainly from Latin America, as well as from Turkey, Spain...

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“We aim to bring in a different kind of a jewellery experience for the consumers,” says Vaishali Banerjee, Managing Director, PGI-India

Vaishali Banerjee made a shift from the advertising and marketing industry to the jewellery industry to create category awareness for a metal that was lesser-known in the subcontinent. Initially, it was all about category creation in a vibrant, mature...

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GSI identified HTHP lab-grown diamond with “laser drill channel”

27 february 2020

Gemological Science International’s (GSI) Mumbai laboratory identified a HTHP lab-grown diamond with what appeared to be laser drilled channel.  

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                                                 Image credit: GSI


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.
It is a common misconception that a diamond can be identified as natural or lab-grown based on inclusions as the claim was made recently on Good Morning America Investigates. 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, GSI reported.

Alex Shishlo, Editor of the Rough&Polished European Bureau