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 11 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 11 is 5.1 centimeters, which is 51mm; The diameter is 1.62 centimeters, which is 16.2mm.
Hong Kong Ring Size Comparison Table
According to the table below, the circumference of the Hong Kong version corresponding to ring number 11 is 5.2 centimeters, which is 52mm; The diameter is 16.6 centimeters, which is 16.6mm.
US Ring Size Comparison Table
According to the table below, the circumference of the US version corresponding to ring number 11 is 6.46 centimeters, which is 64.4mm; The diameter is 2 centimeters, which is 20mm.