| Ring Size | Circumference(mm) | UK,Europe & Australia | CN/SG/JP | Switzerland |
|---|---|---|---|---|
| 5 | 49.3 | J 1/2 | 9 | 9 |
| 6 | 51.8 | L 1/2 | 12 | 11.5 |
| 7 | 54.4 | O | 14 | 14 |
| 8 | 56.9 | Q | 16 | 16.5 |
| 9 | 59.5 | S | 18 | 19 |
| 10 | 62.1 | T 1/2 | 20 | 21.5 |
| 11 | 64.6 | V 1/2 | 23 | 24 |
| 12 | 67.2 | Y | 25 | 27.5 |
| 13 | 70 | . | . | . |
| 14 | 72.8 | . | . | . |
| 15 | 75.3 | . | . | . |
