How to correctly understand 'thousand pure gold' and '10,000 pure gold'

At present, in my country's gold jewelry market, most of the gold products are marked as one thousand pure gold or ten thousand pure gold, so how to correctly understand and understand the difference between the two? At present, in my country's gold jewelry market, most of the gold products are marked as one thousand pure gold or ten thousand pure gold, so how to correctly understand and understand the difference between the two? The gold content of pure gold is not less than 99%, the gold content of one thousand pure gold is not less than 99.9%, and the gold content of ten thousand pure gold is not less than 99.99%. At present, the state stipulates that the highest fineness of gold jewelry is defined as thousand pure gold, and its gold content is 99.9%. As far as the comparison of Wanzujin and Thousand Pure Gold is concerned, although its gold content is only 0.09% behind, the requirements for craftsmanship of Wanzujin Jewelry are almost harsh. It was once an insurmountable gap in the industry, and it is even more important to the traditional craftsmanship. A challenge. Under normal circumstances, the gold jewelry with connection points must use solder due to process requirements. The solder is divided into three types: high solder, medium solder and low solder. The gold content is 940‰, 920‰ and 840‰ respectively. Pure gold and thousand-foot gold jewelry generally use solder with a gold content of more than 90% to ensure the gold purity of the jewelry. The proportion of its solder is about 0.2%. The content of solder in other K gold jewelry is slightly higher, but not more than 8%. The solder composition is mainly based on gold, copper, and tin alloys as raw materials. With the development of technology, it was not until the emergence of 'solder-free welding technology' in 2007 that this historical problem was solved, and the industry problem that the fineness of the finished product was reduced due to the low fineness of gold jewelry solder joints for many years was solved. At present, Wanzujin jewelry usually adopts the world's leading'SFR-9999 gold welding process', and selects the finest gold raw materials. There is no need to use any welding solder during the whole processing process to ensure that the color of the finished product completely exceeds the standard of 99.9% of the thousand pure gold. Achieved 99.99% high purity color. Previous post: The formation and history of diamonds Next post: Be careful about wearing jewelry