We advise choosing a size bigger than your typical ring size because rings with thick bands or stacking styles will feel more constricting than rings with thin bands.
Your ring ought to be comfortable to slide over your knuckle.
| Inside Diameter (mm) | Inside Circumference (mm) | UK & Australia | US & Canada | French & Russian | German | Japanese | Swiss |
| 15.04 | 47.25 | I | 4 3/4 | 47 3/4 | - | - | 7 3/4 |
| 15.40 | 48.38 | J | 5 1/4 | 49 | 15 1/2 | - | 9 |
| 15.80 | 49.64 | K | 5 1/2 | 50 | - | - | 10 |
| 16.10 | 50.58 | L | 6 | 51 3/4 | 16 | - | 11 3/4 |
| 16.92 | 53.16 | N | 7 | 54 | 17 | 13 | 14 |
| 17.75 | 55.76 | P | 8 | 56 1/2 | 17 3/4 | 15 | 16 1/2 |