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| Ring Sizes by Country | Measurement Data（MM） | |||||
| US | Germany | Japan | Switzerland | UK | Perimeter | Diameter |
| 5 | 15.75 | 9 | 49 | J1/2 | 49.3 | 15.7 |
| 6 | 16.50 | 12 | 51.5 | I1/2 | 51.8 | 16.5 |
| 7 | 17.25 | 14 | 54 | 0 | 54.4 | 17.3 |
| 8 | 18 | 16 | 56.5 | Q | 56.5 | 18.1 |
| 9 | 19 | 18 | 59 | S | 59.5 | 18.9 |
| 10 | 20 | 20 | 61.5 | T1/2 | 62.1 | 19.8 |
| 11 | 20.75 | 23 | 64 | V1/2 | 64.6 | 20 |
| 12 | 21.25 | 25 | 66.5 | Y1/2 | 67.2 | 21.4 |
NOTE: This chart provides general sizing information, which can vary depending on style. Still unsure about your ring size?