To help choosing the right size for Your ring You can use the ring size conversion table:
| UK | U.S. | Diameter in Inches | Diameter in MM | Metric MM Equivalent | French | German | Japanese | Swiss |
| L | 5 1/2 | 0.634 | 16.1 | 50.3 | 51 3/4 | 16 | 11 3/4 | |
| O | 7 | 0.683 | 17.35 | 54 | 55 1/4 | 17 1/4 | 14 | 15 1/4 |
| Q | 8 | 0.716 | 18.19 | 56.6 | 57 3/4 | 18 | 16 | 17 3/4 |