best wholesale costume jewelry How to understand gold and silver jewelry? People who understand

major department store wholesale jewelry In order to improve consumer awareness of self -protection, the Provincial Bureau of Industry and Commerce issued consumer tips yesterday to teach consumers to identify the five major tricks of gold and silver jewelry. First, how to identify gold jewelry and brass jewelry. Compared with brass, gold has a strong sense of heavyness. It is oppressed in the palm of the palm, because the proportion of gold is 19.32g / cm3, and the proportion of brass is only 8.9g / cm3. The yellowish the color of the gold, the better the color, and if it is red, the copper impurities are high; if it is white, the silver impurities are high, and the golden color of its gold is low. 2. How to identify K gold jewelry and foot gold jewelry. Differential K gold and foot gold are mainly hardened and elastic. The hardness of K gold is harder than the foot gold, the more pure the foot gold, the soft, and the teeth can bite the traces, while the K gold does not work. The K gold ring falls on the ground and has a strong rebellion, and the foot gold ring falls on the ground without this effect. 3. How to identify gold -plated jewelry and real gold jewelry. The jewelry made of brass materials, plated a thin layer of gold on the surface, is very low in value because its material is hard and difficult to impersonate gold, but some people sell it as 18K gold. Also under "18kgp". The color of this gold -plated jewelry is different from the color of the real gold, which is obviously reddish, lacks golden colors, and the appearance can be different. Fourth, how to identify nickel jewelry and platinum jewelry. Metal nickel is a material for making one yuan coin. It is white, does not oxidize, and looks like the color of platinum material, but the proportion of the two is different. CM3 is significantly different. Fifth, how to identify silver jewelry and platinum jewelry. Although the color of silver and platinum is similar, it is also easy to identify. The proportion of silver is 10.5g / cm3, only 1/2 of platinum. In addition, the sterling silver is soft and easy to oxidize. It will turn black after a period of time in the air, while the platinum is different, which is harder and does not oxidize. The Provincial Bureau of Industry and Commerce also reminds consumers that buying any jewelry should obtain invoices from the merchant. The content of the invoice should be more detailed and consistent with the jewelry you purchased. If you buy jewelry inlaid or diamonds, you should also obtain an appraisal certificate from the merchant. Gold and silver instruments are rare precious metals. They have a beautiful luster, soft texture, and easy to process. Therefore, it has become the most popular processing material for craftsmen. Compared with other materials, this is easy to process. Make gold and silver instruments can also be processed and restructured, renovated, so as to form a variety of forms of gold and silver products. For example, we can restructuring a gold chain as a gold chain to form a collar, bracelet or ring, earrings, etc. Dedicated accessories. But on the other hand, due to the soft gold and silver, its products are easily deformed or damaged after squeezing or collision. In addition, compared with other general metal materials, gold and silver are resistant to atmospheric oxidation and corrosion. Features, after thousands of years, can still be as bright as the beginning. Therefore, many gold and silver products have been passed down from generation to generation, becoming the treasure of the handed down. Especially gold, this characteristic is better. The performance of the silver is slightly worse. The humid ozone will oxidize the surface of the silver. This is what we see. The silver product is used or shelved for a long time. The characteristics of the corrosion of silver anti -sulfurization are not as identical of the authenticity of gold. Gold and silver wares, mainly including two aspects, one is the identification of the texture of their materials, and the other is the identification of its manufacturing age. According to the current scientific and technological means , The identification of gold and silverware can make a more accurate determination. For example, the metal content of the metal contained in the gold and silver container in the gold and silver instrument is determined. The gold and silver content of different parts of the device can also be determined separately. For example, the warring States gold ware unearthed from the tomb of Zenghou Yi in Hubei, which has been measured. Its gold content is more than 85%, and it contains a small amount of silver and trace copper. The Ming Dynasty gold cup unearthed in Shifo Township, Shifo County, has a gold content of 73%, but the gold content of the sufficient and the gold content is only 60%. There are also iron in the foot to weight. Another example is the silverware unearthed in the Han tomb of the Manchu City of Hebei. After being measured, the silver content is 66.10%, the copper is 27.8%, and the tin and lead are 2.5%. The minimum melting point of the silver copper co -crystal tissue. It can be seen that at that time, I had a deep understanding of silver and copper alloy. The identification of the material texture of the gold and silverware, from experience, also accumulated some simple and easy methods. (1) In general, the density of gold is generally a lot of gold products of the same volume, and the gold products must be much heavy. The too light products must be a fake. Things are gently tested on gold and silver products. Generally, the authentic products of dentation are left. The pseudo -scratch is relatively stable. (3) The chemical properties of gold and silver are more stable, especially gold. Copper and iron products are prone to oxidation and rust. Gold in acidic liquids (such as dilute hydrochloric acid, nitric acid, etc.), the color remains unchanged, and copper products will lose gloss only when they touch nitric acid. Not only is it easy to rust, but even the gold plating surface is easily covered by copper.