China
| In 2002, "GB11887 - 2002 Regulations and Nomenclature for the Purity of Jewelry and Precious Metals" was promulgated and implemented, requiring: |
| 1. For products used for ear piercing or piercing of any other part of the human body, which are removed or retained during the healing process of the piercing wound, the nickel content in the total mass must be less than 0.05%. |
| 2. The nickel release of products in long - term contact with the human skin must be less than 0.5 μg/cm²/week. |