18K gold: alloy of 75% gold and 25% other metals, often used to make high-grade jewelry. The most common metal in China market has a gold content of 18×4. 1666=75%. Jewelry should be marked with "18K" or "au750"/"g750".

14K gold: 58.3% gold, alloy with other metals, is one of the most popular jewelry metal choices in Europe and America. Because it is durable and scratch-proof, it is stronger and more economical than other gold products with high K content.

Daily maintenance of 18K gold:

1, try to avoid contact with chemicals when wearing. If you are in frequent contact with articles containing chemical components, the electroplated layer will be easily corroded, exposing the primary color of 18K gold.

2. Avoid collision or friction with hard metal objects. It may cause scratches on the surface of K gold and affect the appearance.

3. Avoid placing the diamond ring in an environment that is too cold or too hot. Metals expand when heated and contract when cooled, so when 18K gold jewelry is placed in an overheated environment, it will be affected by temperature changes, which will lead to sudden loosening or contraction of metals, thus affecting the firmness of diamond inlay.

4. Regular maintenance and inspection 18K gold jewelry.