Monday, February 15, 2010
Whereas the thermal probe can separate diamonds from most of their simulants, distinguishing between various types of diamond irradiated or non-irradiated, etc., requires more advanced, optical techniques. These techniques are also used for some diamonds simulants, such as silicon carbide, which pass the thermal conductivity test. Optical techniques can distinguish between natural diamonds and synthetic diamonds. "Perfect" crystals have never been found, so both natural and synthetic diamonds always possess characteristic imperfections, arising from the circumstances of their crystal growth, that allow them to be distinguished from each other.
Several methods for identifying the synthetic diamonds can be performed, depending on the method of production and the color of the diamond. CVD diamonds can generally be determined by an orange fluorescence. D-J colored diamonds can usually be screened through the Swiss Gemological Institutes Diamond Spotter. Similarly, natural diamonds usually have minor imperfections and flaws that are not seen in synthetic diamonds.
Labels: Diamond Identification
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