Can you understand the certificate of jewellery and jade?
Jade is a categorized gemstone that is widely welcomed in various parts of the world, especially in East Asia. The minerals commonly referred to as jade are mainly jadeite (also known as jadeite, the main component is NaAlSi2O6) and nephrite (tausonite, actinolite, etc., depending on the chemical composition, various colors, more types, but The main components are Ca2(Mg,Fe)5Si8O22(OH)2). Jade in the broad sense includes not only jadeite and nephrite, but also serpentine, lapis lazuli, agate, coral, marble and other gemstones. Buy jade, many people are afraid of buying fake, so they will have a jewelry identification certificate, no jewelry identification certificate, would rather not buy jade that they can not understand, then, jewelry identification certificate, you will see? Let us learn how to look at the jewelry identification certificate. 1. Color: Various colors presented on the surface of jewellery and jade. 2. Photographic characteristics: refers to various phenomena caused by the action of materials on the direction and direction of incident light. It includes the homogeneity, heterogeneity of the material, the axiality of the heterogeneous body and the positive and negative optical properties. 3. Refractive index, birefringence: The ratio of the speed of light propagation in air (or vacuum) to jewels and jade materials is the refractive index, also known as the refractive index. The maximum difference between two or three principal refractive indices in a heterogeneous body is birefringence, also called heavy refractive index (or birefringence). The refractive index of air is N = 1 (refractive index is represented by N). 4. Absorption spectrum: refers to the spectrum produced by the absorption of the luminescence jade material when the continuous spectrum of light is irradiated. 5. Transparency: refers to the degree of light transmission of jewellery and jade materials, which can be transparent, translucent, translucent, micro-transparent and opaque. 6. Gloss: The ability and characteristics of the surface of the material to reflect light. According to the strength of the gloss, it is divided into metallic luster, semi-metallic luster, diamond luster, glass luster and the like. The special luster caused by the aggregate or surface features is grease luster, pearl luster, silk luster and the like. 7. Quality measurement unit: According to the jewellery and jade category, the following measurement units are generally used, namely, carat, gram, kilogram, etc. For example, the unit of measurement for diamonds is carat (or cents), 1 gram (G) = 5 carats (CT), 1 carat (CI) = 0, and 2 grams (G) = 200 mg (MG). The smaller unit is the minute, 1 carat (CT) = 100 points. The pearl is measured by the grain (the diameter of the ball is larger) and the pearl grain (1 carat = 4 pearls). Another example is high-grade Hetian jade, the finished product is in grams, and the raw materials are in kilograms. 8. Density: Density refers to the mass of material per unit volume. The unit is grams per cubic centimeter (g/cm3). 9. Hardness: Hardness refers to the ability of jewels to resist the mechanical action of external scoring, pressing or grinding. Hardness is usually expressed in terms of Mohs hardness. The relative hardness of minerals can be divided into 10 grades: 1 talc, 2 gypsum, 3 calcite, 4 fluorite, 5 apatite, 6 feldspar, 7 quartz, 8 topaz, 9 corundum. , 10 diamonds. The hardness test is generally not used as a routine identification item due to the micro-damaged object. The easiest way: 1. Looking at the sun, there are some cloud-like things in the jade, one by one, the color is transparent, like cotton wool. 2, the hardness of jade is very high, like diamond, so you can draw a trace on the glass. 3, jade is cool, put a hair on the jade, burn with a lighter, burned with jade hair. (It remains to be verified that in fact, when the hair is put on glass or porcelain (silicate mixture), heat transfer will occur, and the ignition point will not be reached, so no burning will occur) 4, water identification method, a drop of water on the jade, such as the dew-like shape of the long-distance of the real jade; water droplets quickly disappeared is a fake. 5, the tongue licking method, the tip of the tongue is really jealous, but the fake jade is innocent. The above details for everyone to introduce the identification method of jade, I hope to help jade lovers, beware of being cheated. Poly Mositure Absorption Polo Shirts 1. Material: 100% cotton, CVC, TC, 100% polyester, lycra, etc. As per your request; Mens Polo Tops,Mens Quick Dry Polo Shirts,Mens Knit Poly Polo Shirts,Poly Mositure Absorption Polo Shirts Shaoxing Harbour Textile&Garments Co., Ltd , https://www.sxharbour.com
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