This material has a similar density to diamond; therefore, the stones could not be identified as diamond imitations through hydrostatic measurement or the use of a 3D-scanner (volume calculation and weight) at the trader’s office.
Although this material and diamonds share a similar density, their crystals display very different growth lines and growth structures due to their particular crystallization. The rough shapes of both materials look completely different from one another. The Lab’s microscopic investigation revealed internal growth planes reflecting orthorhombic growth in the two submitted gemstones.
A Raman analysis, commonly used in chemistry to provide a structural fingerprint by which molecules can be identified, clearly indicated that the heavily included stones were topaz and not diamond. A detailed study of the rather large inclusions also showed the presence of typical bi-phase inclusions of topaz that are as a rule not found in diamonds.
After these different investigations, and given the octahedral shapes of the submitted stones, an obvious conclusion was that the topaz crystals were manipulated and polished to show the typical growth lines and growth structures of diamonds to fool any potential buyer, according to HRD Antwerp. The value of this quality of colourless topaz is believed to be not more than 5 USD/ct. worldwide, more and more topaz are cut to fool rough diamond buyers.
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