The ring size of jade bracelet is usually customized according to the size of wrist, so the specific size will vary from person to person. However, the following are some common sizes of jade bracelet rings for your reference:

Small: about 50 mm-54 mm Suitable for smaller wrists.

Medium: about 55mm-58mm. Suitable for wrists of average size.

Large size: about 59mm-63mm. Suitable for larger wrists.

Extra large: greater than 63mm. Suitable for people with big wrists or who want to wear loose clothes.

Please note that these are just some common size ranges, and the actual sizes may vary from manufacturer to design. If you plan to buy a jade bracelet, it is recommended to go to a professional jewelry store or jeweler, so that they can measure your wrist and customize a bracelet of the right size for you. This will ensure that the bracelet fits your wrist comfortably and avoid being too tight or too loose. In addition, the authenticity and quality of jadeite should be guaranteed when purchasing.