According to the different gold content, the gold content of thousands of gold ornaments is not less than 99.9%, which can be identified as thousands of gold or G999, Au999 and Jin 999.

According to the different gold content, it can usually be divided into 18K gold, pure gold and thousands of gold. 1K is equal to 100% divided by 24, that is, 1K is about 4. 1667%. The theoretical purity of 24K is 100%.

① The gold content of 18K gold jewelry is not less than 750%, which can be identified as18k or G 18K, G750, Au750, Au 18k and Au 750.

② The gold content of pure gold jewelry is not less than 99.0%, which can be identified as pure gold or G990, Au990 and Au 990.

③ The gold content of thousands of gold jewelry is not less than 99.9%, which can be identified as thousands of gold or G999, Au999 and Jin 999. In addition, some gold ornaments such as 9K (gold content not less than 37.5%), 14K (gold content not less than 58.5%) and 22K (gold content not less than 9 1.6%) can be seen in the market (especially abroad).