How to identify natural gems and jade

How to identify natural gems and jade

20 years of reform and opening up, Chinese jewelry sector has made great progress and achievements. Experts predicted that the 21st century jewelry industry to support the national economy may become a pillar industry in steady development. Current jewelry jewelry industry, is in from extensive to intensive one stage, that is, by the emphasis on quantity (production, sales) growth, shift to promoting scientific and technological progress, update of varieties, and improving economic efficiency gem appraisal , can be divided into three areas:
① gem naming, to determine what it is.
② material classification, specific material properties.
③ gem quality classification.
(1) gem naming. For the gemstone identification, precious stones were measured and the density, refractive index data, you can set the name. For example: the jewel in the measured density of 3.52 (± 0.01) g / cm "3, a refractive index of 2.417, dispersion O.O44, combined with its high thermal conductivity, can be called the Diamond (Diamond). if it also has a gem mineral chemical composition, crystal structure data, the more accurate naming stones perfected. in the gem mineral species on the basis of naming, and then by color or special light of (cat, Star, discoloration, and changes color) divided variant. For example: beryl gemstone minerals by the color variation of the name carved out of green beryl (also known as Emerald), said the aquamarine blue beryl, colorless, transparent beryl Beryl said. beryl variety of special light There Beryl Cat's Eye, Star Beryl, etc.. corundum mineral divided by the color variants of the name. with special light of corundum, can draw star ruby, star sapphire, sapphire, cat's eye and so on.
(2) material classification. Material classification and identification is made gem Jian Dingzhe one of the most difficult tasks. Naming in the gem, you must first answer the following questions:
① This gem is natural or synthetic, or man-made from?
② After the stones are stained, surface coating? Note whether the oil or chemical to be handled?
③ The stones are heat-treated or color diffusion treatment?

gemstone suppliers
Address：http://www.winbowgems.com/Gemstone_Knowledge/identify-natural-gemstone-jade%20.html