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  • (Photo courtesy: HRD Antwerp)

Polished topaz imitates rough diamond

HRD Antwerp’s research department has recently identified two rough stones, which were believed to be diamonds, as topaz.

According to their report dated 12 July 2017, the two near-colourless rough stones weighed 50.08 and 38.18 carats. Though topaz shares a similar density to diamond, their crystals display very different growth lines and growth structures due to their particular crystallisation. The rough shapes of both mater4ials look completely different from each other. “The octahedral shapes of the submitted stones were manipulated and polished to show the typical growth lines and growth structures of diamonds to fool any potential buyers,” said the laboratory.

The value of this quality of colourless topaz is believed to be not more than US$5 per carat worldwide, more and more topaz are cut to fool rough diamond buyers, according to HRD Antwerp.

 

 

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