Gold jewelry refers to jewelry made from gold as the main raw material. The chemical symbol for gold is Au, with a specific gravity of 17.4 and a Mohs hardness of 2.5. Gold jewelry can be divided into pure gold and K gold from its gold content. The gold content of pure gold jewelry is above 99%, and the highest is 99.99%. Therefore, it is also known as “Jiujiujinâ€, “Full Gold†and “Red Goldâ€. So, what are the qualities of gold jewelry? Xiaobian will take you to analyze the quality of gold jewelry. The gold content of gold products is called color. There is a clear rule for the country of coloring, that is, each piece of gold jewelry sold by the merchant must be listed to indicate its gold content and weight. There are three kinds of gold jewelry in China, among which the gold and the thousand gold are recognized by the state, and the full gold is the definition of the gold jewelry. The gold content is not less than 99% called full gold, the full gold is dark yellow, commonly known as "two 9"; the gold content is not less than 99.9% called thousands of gold, commonly known as "three nine", is the highest value in jewelry coloring. “Wanju Gold†is a trademark registered by a company for its own gold jewelry, commonly known as “four ninesâ€. There is no national standard for “Wanju Goldâ€, and the country does not have the price tag of 10,000 yuan. In fact, it has higher color and production process. The gold jewelry's imprint includes the manufacturer's code, material and purity, such as: X gold 990, S12G million gold, X gold. Among them, the letter X is the manufacturer code. When jewellery is made of precious metals of different materials or different purities, the materials and purity should be marked separately. FR Suits can inhibit the ignite prevent the spread of flames,keep away from the impact of high heat,and FR Suits can do almost immediately self-extinguishing after move away fire source.The other fabrics suits will be fired since the ignition point,flame spread quickly,and it is still on fire after move away the fire source, until it has been put out or flammable material is burned. FR Coveralls capable of preventing itself from being ignited or slowing and terminating combustion after contact with a flame or hot object.we produce FR Suits,FR Jackets,FR knitted t-shirt, FR Bibs are all certified. If you need Flame Retardant Fabric to meet certain FR standard, we can provide you relative FR certificate, and make sure the specific code which you received is valid. Sometimes, certified corresponding fabric may not be exactly what you need, but most important is the connection between us, and you trust us. Fr Suits,Fire Retardant Suit,Flame Retardant Suit,Fireproof Suit Xinxiang Xinke Protective Technology Co, Ltd. , https://www.coverallsuits.com
