Reference
Size Guide
Use the Gaura size chart below to compare internal diameter with common US, UK, EU, and Japan references.
Ring size chart
Measure an existing ring that fits well, compare the internal diameter in millimeters, and match it to the chart below.
| Gaura Size | Diameter (mm) | USA | UK | Europe (EU) | Japan |
|---|---|---|---|---|---|
| 12 | 12 | – | – | – | – |
| 12.5 | 12.5 | – | – | – | – |
| 13 | 13 | – | – | – | – |
| 13.5 | 13.5 | – | – | – | – |
| 14 | 14 | 3 | F | 44 | 4 |
| 14.5 | 14.5 | 3.5 | G | 45 | 5 |
| 15 | 15 | 4 | H | 47 | 7 |
| 15.5 | 15.5 | 4.5 | I | 48.5 | 8 |
| 16 | 16 | 5 | J | 50 | 9 |
| 16.5 | 16.5 | 5.5 | K | 51.5 | 11 |
| 17 | 17 | 6 | L | 52.5 | 12 |
| 17.5 | 17.5 | 7 | M | 54 | 14 |
| 18 | 18 | 7.5 | N | 55.5 | 15 |
| 18.5 | 18.5 | 8 | O | 57 | 16 |
| 19 | 19 | 8.5 | P | 58 | 17 |
| 19.5 | 19.5 | 9 | R | 60 | 18 |
| 20 | 20 | 10 | T | 62 | 20 |
| 20.5 | 20.5 | 10.5 | U | 63 | 22 |