In the gemstone market, cases of counterfeiting of certified diamonds having a gia conclusion have become more frequent. The stones are replaced with synthetic ones with the same parameters and engraving on the girdle.
Of course, not necessarily.
Gemological examination can be carried out both for loose stones and for stones, which are inserts in jewelry.
The technology of engraving the numbers of expert opinions on diamond gangsters was first used by the US GIA laboratory in the early 2000s