When you buy bracelets at Chow Tai Fook, you usually mark the weight and ring slogan on the tag of the bracelet. If you don't have a circular slogan, you can ask the staff of Chow Tai Fook Store to measure the circular slogan of the bracelet for you with calipers. In other words, you can clearly know the ring size of the bracelet at the purchase site. You can also query through the security code on the label.

The diameter of the bracelet ring can be measured with a ruler, which is the size of its ring.