Ring Size Guide
| Diameter (mm) | Spain / Italy Size | US Size | UK Size | French Size | Japan Size |
|---|---|---|---|---|---|
| 15.6 mm | 9 | 5 | J 1/2 | 49 | 8 |
| 16.2 mm | 11 | 5 3/4 | K | 51 | 10 |
| 16.5 mm | 13 | 6 | L | 53 | 12 |
| 17.2 mm | 14 | 7 | N | 54 | 14 |
| 18.1 mm | 17 | 8 | P | 57 | 16 |
| 18.5 mm | 18 | 8 1/4 | Q | 58 | 17 |
| 19.0 mm | 20 | 9 | R | 60 | 19 |
| 19.8 mm | 21 | 10 | T | 62 | 20 |
| 20.7 mm | 25 | 10 3/4 | U 1/2 | 65 | 23 |
| 21.8 mm | 28 | 12 1/2 | Z | 68 3/4 | 26 |