Buying Amber rings and need help to Convert US Size to European size? Below is a conversion table :
| Diameter (mm) | Circumference (mm) | USA / Canada | UK / Australia | Asia | Switzerland |
| Europe / ISO | |||||
| 14.1 | 44.2 | 3 | F | 4 | 4 |
| 14.3 | 44.8 | F-1/2 | 5 | 5 1/2 | |
| 14.5 | 45.5 | 3 1/2 | G | ||
| 14.7 | 46.1 | G-1/2 | 6 | 6 1/2 | |
| 14.9 | 46.8 | 4 | H | 7 | |
| 15.1 | 47.4 | H-1/2 | 7 3/4 | ||
| 15.3 | 48 | 4 1/2 | I | 8 | |
| 15.5 | 48.7 | J | 9 | ||
| 15.7 | 49.3 | 5 | J-1/2 | 9 | |
| 15.9 | 50 | K | 10 | ||
| 16.1 | 50.6 | 5 1/2 | K-1/2 | 10 | |
| 16.3 | 51.2 | L | 11 3/4 | ||
| 16.5 | 51.9 | 6 | L-1/2 | 11 | 12 3/4 |
| 16.7 | 52.5 | M | 12 | ||
| 16.9 | 53.1 | 6 1/2 | M-1/2 | 13 | 14 |
| 17.1 | 53.8 | N | |||
| 17.3 | 54.4 | 7 | N-1/2 | 14 | 15-1/4 |
| 17.5 | 55.1 | O | |||
| 17.7 | 55.7 | 7 1/2 | O-1/2 | 15 | 16-1/2 |
| 17.9 | 56.3 | P | |||
| 18.1 | 57 | 8 | P-1/2 | 16 | 17-3/4 |
| 18.3 | 57.6 | Q | |||
| 18.5 | 58.3 | 8 1/2 | Q-1/2 | 17 | |
| 18.8 | 58.9 | R | 19 | ||
| 19 | 59.5 | 9 | R-1/2 | 18 | |
| 19.2 | 60.2 | S | 20-1/4 | ||
| 19.4 | 60.8 | 9 1/2 | S-1/2 | 19 | |
| 19.6 | 61.4 | T | 21-1/2 | ||
| 19.8 | 62.1 | 10 | T-1/2 | 20 | |
| 20 | 62.7 | U | 21 | ||
| 20.2 | 63.4 | 10 1/2 | U-1/2 | 22 | 22-3/4 |
| 20.4 | 64 | V | |||
| 20.6 | 64.6 | 11 | V-1/2 | 23 | |
| 20.8 | 65.3 | W | 25 | ||
| 21 | 65.9 | 11 1/2 | W-1/2 | 24 | |
| 21.2 | 66.6 | X | |||
| 21.4 | 67.2 | 12 | X-1/2 | 25 | 27-1/2 |
| 21.6 | 67.8 | Y | |||
| 21.8 | 68.5 | 12 1/2 | Z | 26 | 28-3/4 |
| 22 | 69.1 | Z-1/2 | |||
| 22.2 | 69.7 | 13 | 27 | ||
| 22.4 | 70.4 | Z + 1 | |||
| 22.6 | 71 | 13-1/2 |