In the past two years, gold has triggered a round of gold purchases. I believe many people have bought gold jewelry. The following small series gives you the key points of science and technology.
1, jewelry weight
Gold jewelry is calculated by weight and processing fee. The weight of the jewelry is one of the important indicators. According to the standard, the measurement unit of the weight of the jewelry is gram, and the tolerance of the single piece of gold jewelry is 0.01g.
2, logo
Gold jewelry imprint should contain the manufacturer code, precious metal material name and content.
3, appearance quality
It is mainly the inspection of the specific process quality of the overall shape and processing quality of jewelry.
4, gold content
The gold content in jewelry is an important indicator of its quality. There are many methods for testing gold content, which can be divided into chemical analysis methods and instrumental analysis methods. According to whether the jewelry is damaged during the testing process, it can be divided into non-destructive testing method and lossy testing method. The daily inspection in the jewelry quality supervision department is generally based on non-destructive testing method. The density method is combined with X-ray fluorescence spectrometry and electron probe. Large instrument analysis. The market supervision and spot check is mainly based on damage detection. The fire test method is the national test method for measuring the gold content in jewelry in China.
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