How to distinguish between diamond and colorless zircon

Zircon: before in man-made cubic zirconia, zircon is the best diamond substitute. Zircon strong birefringence, namely it has two refractive index, and the differences between two refractive index is larger. Which leads to a very special optical phenomenon, when with a magnifying glass observation about good zircon edge surface gem, by its top surface can be seen at the bottom of the plane and ridge has obvious double. And diamond because of 'property' is, no one like a shadow. Some colorless stones in shape and using somewhat similar to that of the diamond and diamond is the most similar gem zircon, because colorless zircon also has a larger refractive index and dispersion, processed zircon has radiant appearance, so it is one of the best natural substitute in diamond. So, how to distinguish between diamond and colorless zircon? The difference between diamond and zircon is very simple. First is polarized and refractive index. Diamonds are gems of cubic system, no polarization and double refraction, and polarization and zircon birefringence, down from the crown to look on the pavilion side edge, will find a rib into two appear 'double' phenomenon, namely the diamond is absolutely a rib. Using the method of hardness also easy to distinguish between diamond and colorless zircon. Just going to appraisal of gem score a synthetic sapphire can know, if you would draw mark is diamond, such as sliding, stroke is not a diamond. Other natural color gems, due to the refractive index tend to be smaller, and even cut wear is very good, it is hard to have 'splendor' and 'bean rice pattern' appearance. The refractive index of the diamond is 2. 42, is beyond the scope of general refractometer readings, and generally of gems, such as colorless, yellow jade, crystal, etc. It is easy to measure the refractive index ( Like other characteristics similar to diamond, the determination of refractive index, so as not to scratch the refractometer) 。 In addition, the general gem processing are often not strict, light-leaking occur frequently, and a little older diamond ( Such as more than 30 points) , because of its precious value, processing often strictly, generally do not. More diamond consulting visit/jewelry net