Pure gold 999 steel seal, you can't punch holes at will. The 999 steel seal of pure gold is 99.9% gold content, and the steel seal is the ID card of gold jewelry. When doing identification, the first step is to look at the steel seal of gold. Steel seal is an important evidence to identify the authenticity of gold. It is composed of sanctions and purity, and some brands or manufacturers will be added, so you can't just punch in.

Gold jewelry usually has thousands of gold and K gold, with different marks:

1, pure gold: the gold content is not less than 990/ thousand, and it is marked as "Full Gold", "Gold 990", "G990" and "AU990" respectively.

2. Qianjin: The gold content is not less than 999, and it is marked as "Jin 999", "G999" and "AU999" respectively.

3.k gold: also known as colored gold, it refers to precious metals with a gold content between 8K and 24 K. The gold content of 18K gold is 750‰, marked as "750" and "18K" respectively, and the gold content of 14K gold is 585‰, marked as "585" and "65438" respectively.