The size range of Chinese rings is 4-26, that of European rings is 44-61, and that of American rings is 5-12. Therefore, No. 20 rings belong to Chinese sizes. Please check the ring size comparison table of Chinese Mainland or Hong Kong versions.
Mainland version ring size comparison chart
According to the table below, the circumference of the mainland version corresponding to ring size 20 is 60mm and the diameter is 19.1mm.
Hong Kong Ring Size Comparison Table
As shown in the table below,
Ring size 20
