Ring Size Guide
Cla works in standard US ring sizes. Approximate equivalents in other commonly used sizing systems are provided below. If you are unsure of your size, we highly recommend visiting your local jeweller and getting sized professionally.
Please note that because all of our items are made to your order, we are unable to accept returns or exchanges due to incorrect sizing.
| Inside diameter (mm) | US | UK/AU | Japan | HK |
| 12.4 | 1 | B | 1 | – |
| 13.2 | 2 | D | 2 | – |
| 14.1 | 3 | F 1/2 | 4 | 6 |
| 14.9 | 4 | H 1/2 | 7 | 8 |
| 15.3 | 4 | I 1/2 | 8 | 9 |
| 15.7 | 5 | J 1/2 | 9 | Approx. 10 |
| 16.1 | 5 1/2 | K 1/2 | 10 | Approx. 11 |
| 16.5 | 6 | L 1/2 | 11 | Approx. 12, 13 |
| 16.9 | 6 1/2 | M 1/2 | 13 | 14 |
| 17.3 | 7 | N 1/2 | 14 | 15 |
| 17.7 | 7 1/2 | O 1/2 | 15 | Approx. 16 |
| 18.1 | 8 | P 1/2 | 16 | Approx. 17 |
| 18.5 | 8 1/2 | Q 1/2 | 17 | Approx. 18 |
| 19 | 9 | R 1/2 | 18 | Approx. 19, 20 |
| 19.4 | 9 1/2 | S 1/2 | 19 | 21 |
| 19.8 | 10 | T 1/2 | 20 | 22 |