> Classification system > Online help classification > Product > Ring Size Reference | Ring Size Reference | |||||||
| USA | U.K. | China | Japan | Diameter | Circumference | ||
| mm | inch | mm | inch | ||||
| 5 | J 1/2 | 9 | 9 | 15.6 | 0.61 | 49 | 1.93 |
| 6 | M | 12 | 12 | 16.4 | 0.65 | 52 | 2.05 |
| 7 | O | 14 | 14 | 17.3 | 0.68 | 54.5 | 2.15 |
| 8 | Q | 16 | 16 | 18.1 | 0.71 | 57 | 2.24 |
| 8½ | Q½ | 17 | 17 | 18.5 | 0.73 | 58.3 | 2.30 |
| 9 | S | 18 | 18 | 18.9 | 0.74 | 59.5 | 2.34 |
| 9½ | S½ | 19 | 19 | 19.3 | 0.76 | 60.8 | 2.39 |
| 10 | T 1/2 | 20 | 20 | 19.7 | 0.78 | 62 | 2.44 |
| 10¼ | U | 21 | 21 | 20 | 0.79 | 62.7 | 2.47 |
| 10½ | U½ | 22 | 22 | 20.17 | 0.79 | 63.4 | 2.50 |
| 11 | V 1/2 | 23 | 23 | 20.6 | 0.81 | 64.5 | 2.54 |
| 12 | Y | 25 | 25 | 21.4 | 0.84 | 67.5 | 2.66 |
We will send you the ring size you choose the size, if not this ring size you choose, we will send you the similar ring size, if you do not want to select a similar ring size, please indicate "only ring size"
