Gold products produced according to national standards, including pure gold and thousands of pure gold; The designated sales unit of standard gold ornaments refers to jewelry gold shops or department stores that abide by these measures and are evaluated by Fujian Baoxie, with quality up to standard and standardized price composition.
quality requirements
The nominal value of gold content of OTC pure gold jewelry and thousands of pure gold jewelry must be consistent with the actual test results (to ensure that the gold content of the sample is detected in a uniform state after melting); Each piece of jewelry must be engraved with the material name, material content and manufacturer code according to the standard. Every piece of jewelry must have a quality certificate tested by an inspection agency.
Gold jewelry logo: the logo engraved on the gold jewelry should include the manufacturer, origin and gold content. Jewelry marks are generally engraved on the inner ring of jewelry, while necklaces are marked on the buckle. Because the state stipulates that all gold ornaments must be stamped with steel seal, for example, JY is the name of the manufacturer, and thousands of gold represents the purity of 99.9%. If it is pure gold, the purity is above 99%. When buying gold, you must pay attention to the steel seal.
Platinum jewelry imprint: The imprint engraved on platinum jewelry should include the manufacturer, place of origin and platinum content. For example, Pt999 with a platinum content of 999‰, Pt990 means that the platinum content is not less than 990‰, and Pt900 means that the platinum content is not less than 900‰.
The red series of K-gold jewelry is mainly made of gold and copper, with a small amount of silver added, and the color is light red. The yellow series of K gold jewelry (K yellow for short) refers to the alloy of gold, silver and copper. According to the content of gold, K gold jewelry with different K numbers can be made, mainly including 22K, 18K, 14K, 10K, 8K, etc ... Asians like high K gold jewelry, such as 22K and 18K, and Europeans and Americans like 14K gold jewelry. The color depth of yellow K-gold jewelry series is related to the gold content in K-gold and the ratio of silver to copper. 18K gold is yellower than 14K and 10K gold jewelry, while gold jewelry with the same number of k is lighter if silver is lighter than copper yellow, and darker if copper is silvery yellow.
K gold: indicates the corresponding k number. The common K-gold jewelry in China is marked "G 18K, Au750", with a gold content of 75%. K gold is divided into gold, red gold, platinum and colored gold. Platinum is easily confused with platinum in appearance and can be distinguished from the imprint.
If the silver label is S925, the silver content is 925‰, S990 silver is 990‰, and S999 silver is 999‰.
Palladium jewelry imprint: The imprint engraved on palladium jewelry should include the manufacturer, place of origin and palladium content. For example, Pd999 with a palladium content of 999‰, Pd990 means that the palladium content is not less than 990‰, and Pd900 means that the palladium content is not less than 900‰. Palladium is much lighter than platinum, and its price is less than half that of platinum.
Gold plating of imitation jewelry means that a thin layer of gold GP or KP is plated on the jewelry made of copper or silver by using the principle of electrolysis, and the gold-plated jewelry is marked with "GP" or "KP". Gold plating refers to plating gold foil on the surface of metal materials such as silver and copper. The fineness of gold foil should be no less than 10K and the weight should be no less than 1/20 of the total weight of the material, which is usually marked with KF. Forging gold is a kind of gold plating, which is to forge gold foil on the surface of other metal jewelry blanks at high temperature and high pressure. The fineness of gold foil shall be greater than 10K, in which the total amount of forged gold shall not be less than 5% of the finished product, and marked with "GF" or "KGF". Forged gold has strong surface hardness and high wear resistance, and it is not easy to lose the gold texture.