Wrap a thin strip of paper around the base of your finger, mark where it overlaps and measure the length in millimetres. Or measure the inside diameter of a ring you already own.
| Lunea size | EU size | Inside diameter | Circumference |
|---|---|---|---|
| 5 | 49 | 15.7 mm | 49.3 mm |
| 6 | 52 | 16.5 mm | 51.9 mm |
| 7 | 54 | 17.3 mm | 54.4 mm |
| 8 | 57 | 18.1 mm | 57.0 mm |
| 9 | 59 | 18.9 mm | 59.5 mm |
Between two sizes? Choose the larger one for wide bands, the smaller one for slim stacking rings.