Thousands of gold with a gold content of not less than 999 is called thousands of gold, which is the highest value in jewelry color naming. The imprint of gold jewelry includes manufacturer code, material and purity. Second, inspection method: 1, logo jewelry stamp should contain the manufacturer's code, the name and content of precious metal materials. 2. The appearance quality is mainly the inspection of the overall modeling and processing quality of jewelry. 3. Jewelry Weight Gold jewelry is calculated by weight and processing fee. The weight of jewelry is one of the important indicators. According to the standard, the weight of jewelry is measured in grams, and the tolerance of a single piece of gold jewelry is 0.01g. 4. Gold content of jewelry is an important indicator of its quality. There are many methods to test gold content, which can be divided into chemical analysis and instrumental analysis. According to whether jewelry is damaged in the process of testing, it can be divided into nondestructive testing and destructive testing. In the daily inspection of jewelry quality supervision department, nondestructive testing is the main method, and density method is combined with X-ray fluorescence spectrum, electron probe and other large instruments for analysis. Damage detection is the main method of market supervision and spot check, and fire assay is the national detection method for determining the gold content of jewelry.