Crystal is one of more than 3,000 minerals in nature. Its chemical composition is silica, its density is 2, 65, its Mohs hardness is 7, its birefringence is 1,544--1, 553, crystal is transparent. Often in the shape of a hexagon. The crystal is high in hardness and crystal clear. It has been favored by human beings since ancient times and has been included in the ranks of gemstones in all countries of the world. At first glance, the selection of materials: crystal materials with excellent materials should not see star-shaped, cloud-like and flocculent gas-liquid inclusions. The texture is pure, smooth and crystal-clear. If it is found that there are cracks and spots with different depths, it is a defective product. Second, look at the work: the processing of crystal products is divided into two types, namely the grinder and the engraver. Such as crystal necklaces, bracelets, earrings, etc. are abrasive products; Guanyin image, inner painting snuff bottle, etc. are engravings. A well-made crystal product should be refined, not only can fully reveal the external beauty (styling, style, symmetry, etc.) of the crystal product, but also can maximize its inner beauty (smooth, clever color). Three look polishing: the quality of polishing directly affects the value of crystal products. The crystal must be honed by diamond sand during the processing, and the rough production will cause traces of friction on the crystal surface. Good crystal products have better natural transparency and luster, and they are said to be "fire heads" in jargon. Four look at the hole: For the wearing of crystal products (such as necklaces, bracelets, beads), it depends on whether the hole is straight, the thickness of the hole is symmetrical, with or without small cracks. The wall of the hole must be clear and transparent, without "white marks". Five colors: Even in the same kind of crystal, the texture and color of different parts of it are different. It belongs to a single color, and the chromaticity is uniform. If there is a shade on the same crystal, the color tone is required to be beautiful. Six look at coordination: When buying crystal jewelry, you should try to wear it to see its size, tightness and length. If it is inlaid with ornaments, see if it is firm, Zhou Zheng and coordination. Also pay attention to whether the style and color of crystal jewelry are coordinated with your body, skin color, face and clothing. Master the above aspects, I believe that you will be able to pick the crystal products that you like.
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