The ring size range in China is 4-26, in Europe it is 44-61, and in the United States it is 5-12. Therefore, size 9 belongs to either China or the United States, and you need to refer to the comparison table of ring sizes in China or the United States.
Mainland version ring size comparison chart
According to the table below, the circumference of the mainland version corresponding to ring number 9 is 49mm and the diameter is 15.6mm.
Hong Kong Ring Size Comparison Table
As shown in the table below,
The circumference of the European version corresponding to ring number 9
US Ring Size Comparison Table
As shown in the table below,
The circumference of the 9th ring corresponds to the American version
