Diamond, the name of the diamond, is the recognized king of gems. Its greatest feature is the highest hardness and a strong refractive index, radiant in the light, dazzling. But its surface is similar to glass, crystal and artificial diamonds, making it difficult to distinguish. Accurate identification can only be measured by instrument, and simple identification can be done in the following ways: 1, hardness test Diamonds are the hardest naturally occurring substances known. There is nothing to mark the diamonds. If you can mark them, they are not diamonds. 2, thermal conductivity test At the same time, you should breathe a sigh of relief on diamonds and other similar items. If it is a diamond, the water mist on its surface should evaporate faster than the water mist on other items. This is because diamonds have high thermal conductivity. 3, observe the reflected light A magnifying glass can be used to observe a very fine frosted and lustrous reflected light at the waist of the diamond. This feature of diamonds is unique. 4, look at the growth point Under the magnifying glass, there are often grooves and triangular growth points on the crystal faces of genuine diamonds, and there are three types of products: 1 ordinary glass with alumina added, which is easy to enter due to the increase in refractive index and dispersion, but has low hardness. 2 Chemically synthesized sapphire and colorless spinel imitation, the hardness is close, but the refractive index is low and there is birefringence, and ghosting can be seen under the magnifying glass. 5, the same chemical composition test The chemical composition of pencils is the same as carbon and diamonds, but the physical structure is different. Therefore, many people use pencils to detect the authenticity of diamonds, which is a more practical and effective method. In the identification, the diamond should be wetted with water first, and then gently scribble with a pencil. On the crystal face of the real diamond, where the pencil is drawn, there is no trace, and if it is not a diamond, but a glass Materials such as crystals will leave traces on the surface. In general, pencils are used to identify the true and false of diamonds. The accuracy of this method is higher. 6, look at the reflection of the light Artificial zirconia is imitation, with high hardness and good refraction, but it will reflect more color light when it rotates, which is obviously different from the fact that only the weak yellow and blue color light is reflected when the product rotates. 7. Diamond identification agency GIA Certified Gemological Institute of America http:// IGI Certified International Gemological Institute http:// HRD Certified Belgian Gemological Institute http:// 8, diamond certificate US GIA certificate US GTC certificate US GTA certificate Belgian IGI certificate US EGL certificate US NGTC certificate Japanese CGL certificate US GEMES certificate ZHE JIANG LUO RUI IMPORT CO.,LTD. , https://www.lrknitted.com