The longevity lock bought by China Gold is marked. There will be logo lettering on gold jewelry, which represents the gold content and purity of jewelry. Some lettering is laser printing, that is, laser printing lettering. There is a dark place in the jewelry bought back, that is, the word seal, and there is also a steel seal that was nailed by hand when leaving the factory. Different kinds of jewelry have different uses. Just like this hollow 3d process, it is made of laser. As long as it is gold jewelry, there will be marks. The mark is like everyone's ID card. Jewelry also has its own identity tag. You'd better not buy unmarked ones.