Fake Rough Diamonds

This article appeared in GCI labs livejournal

Fake Rough Diamonds

Last week GCI Gemological Centers received from the Goverment Diamond Control, a parcel of 346.07 carat of crystals, imported as natural rough diamonds from Tanzania.
The importer was sure that he got genuine diamonds. The crystals in the parcel had a shape similar to natural rough diamonds, and some of them showed noticeable surface lines, “positive triangles”, frosted surfaces, internal inclusions and fractures. Specific Gravity was close to that of natural diamond . After testing and inpection of the goods at GCI laboratory, all the parcel was indetified as  topaz crystals – not even one single diamond !!! , The surface lines were engraved intentionally on the crystals.
Here you can find some pictures of different shapes rough crystals, taken while inspected at GCI.

Original article By Semyon Felshyn 
Submitted by ,
MonicaGS
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