The ring size range in China is 4-26, the ring size range in Europe is 44-61, and the ring size range in the United States is 5-12. Therefore, the ring size 21 belongs to the Chinese size. Please check the ring size comparison table in Chinese Mainland or Hong Kong.
Mainland version ring size comparison chart
According to the table below, the mainland version of ring 21 corresponds to an inner diameter of 19.4mm and a circumference of 61mm.
Hong Kong Ring Size Comparison Table
As shown in the table below,
The inner diameter of the Hong Kong version corresponding to ring 21 is 19.2mm, and the circumference is 63mm.
