How did Dang Ngoc Thao allegedly falsify gem certifications?

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Dang Ngoc Thao allegedly falsified gem certifications by altering laser inscriptions and replacing them with PNJ markings
Police allege that Dang Ngoc Thao, the former director of PNJ Laboratory, falsely certified gems that were sourced in India for resale in Vietnam. The allegation is that he removed the gems’ laser inscriptions and replaced them with the company’s own markings before certification.
He allegedly certified gems sourced from India for resale in Vietnam
Authorities accused Dang Ngoc Thao of falsely certifying gems that originated in India. Those gems were then allegedly prepared for resale in Vietnam through the certification process connected to PNJ.
He allegedly removed existing laser inscriptions from the gems
The case description says he removed the gems’ laser inscriptions. Laser inscriptions are treated as identifying markings on stones, and the accusation is that the original inscriptions were taken off.
He allegedly replaced the original markings with PNJ’s own
After removing the original laser inscriptions, police allege he replaced them with markings used by the company. This is described as the step that made the gems appear to carry the company’s own identification during certification.
The certification was linked to a broader diamond smuggling investigation
The allegations sit within an investigation into an international diamond ring accused of smuggling 28,000 gems worth nearly US$11 million. Police said they seized 1,239 diamonds so far, alongside jewellery for which no invoices or documents proving origin could be produced.

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How did Dang Ngoc Thao allegedly falsify gem certifications?

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