Diamonds and diamond imitations how to identify?

Diamond now known as the king of precious stones, is one of the most expensive gems. Therefore, there are people trying real ones make huge profits. Prior to the synthesis of zirconium carbide, diamond imitations are cubic zirconia, YAG (yttrium aluminum garnet) and so on. As the AYC easy to wear faded, oxidized boron pen used to make carved YAC will make it fully shown experimental prototype. So, now rarely seen its traces of the. Cubic zirconia, high hardness, also more widely popular, suitable for clothing. Some criminals as the cubic zirconia to sell natural diamonds. In fact, the easiest to identify cubic zirconia and diamond way: that with a clean cloth or chamois wipe to be tested products, chemicals to be tested with a finger click, if the test items have obvious fingerprints, it is diamond because diamonds are pro-oil, whereas a cubic zirconia, cubic zirconia is because hydrophilic.
Synthesis of silicon carbide that Moissanite is the latest diamond imitations. The common color is yellow, the chemical composition is silicon carbide, hardness of 9.25, the proportion of 3.? 22. A pair of refractive index, refractive index 2.648-2.691, birefringence is 0.043. The thermal conductivity of silicon carbide and synthetic diamond close to capacity, with a synthetic diamond thermal conductivity tester diamond silicon carbide reaction occurs, it can not rely on thermal conductivity meter identification, synthesis of silicon carbide as a high hardness and high refractive properties of reasons, have been cut Synthesis of silicon carbide and diamond surface reflection and gloss very close. Is not easy to distinguish the document with the hardness of diamond and silicon carbide synthesis. It can be detected using the following assessment instruments: magnifying observation.

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1, synthesis of silicon carbide faceted ridge although the hardness of up to 9.25, it is still far better than diamonds, so still and diamond faceted ridge so sharp.
2, complex single-reflection diamond film observed, while the synthesis of SiC compared to birefringence, and the two values vary widely, so it will produce complex film, surface ridge will instantly become the two images. Synthesis of silicon carbide in the cutting, but often will not affect the direction of complex (ie the optical axis direction) perpendicular to the desktop, it must be tilted at an angle or side impact observed complex phenomena can be seen.
3, the internal characteristics of diamonds, often with angular minerals in cracks or other features, synthetic silicon carbide is often needle-like objects with similar characteristics.
Second, synthetic silicon carbide / diamond tester testing.
Synthesis of silicon carbide and diamond is almost the same as the semiconductor material, the impurities were very low. Measured with a test is the relative transparency of the near ultraviolet region. On the near-UV, near colorless diamond is transparent, while the synthesis of silicon carbide is absorbed. Will be tested faceted gem polishing the probe in contact with the instrument, while a small diagonal high-intensity halogen light it. If the indicator light and a beep when the test is that the diamonds did not respond are synthetic silicon carbide. However, if the diamonds contain a large number of inclusions, the apparatus can not correctly identify.

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