| Inside Diameter MM | U.S.A Sizes | Our Ring Sizes | European Sizes(Some of our rings have European sizes) |
|---|---|---|---|
| 14.9 mm | 2.5 – 3 | 4 | 44 |
| 15.7 mm | 3.5 – 4 | 6 | 46 |
| 15.3 mm – 15.6 mm | 5 | 8 | 48 |
| 16.2 mm | 50 | ||
| 16.6 mm | 6 – 6.5 | 12 | 52 |
| 16.9 mm | 54 | ||
| 17.2 mm – 17.8 mm | 7 – 7.5 | 15 | 56 |
| 18.1 mm – 18.5 mm | 8 – 8.5 | 17 | 58 |
| 19.1 mm – 19.4 mm | 9 – 9.5 | 19 | 60 |
| 19.7 mm – 20.4 mm | 10-10.5 | 21 | 62 |
