Here you will find the inner diameter of North American ring sizes, which are the exact sizes that you can expect when you order a North Faun ring. Although each North Faun ring is forged by hand from scratch, exact formulas are used to create your ring band, with the inner diameter doubled checked with calibrated digital calipers to ensure accuracy.
| Ring Size | Inner Diameter |
| 4 | 14.86 mm |
| 4.25 | 15.04 mm |
| 4.5 | 15.27 mm |
| 4.75 | 15.53 mm |
| 5 | 15.70 mm |
| 5.25 | 15.90 mm |
| 5.5 | 16.10 mm |
| 5.75 | 16.30 mm |
| 6 | 16.51 mm |
| 6.25 | 16.71 mm |
| 6.5 | 16.92 mm |
| 6.75 | 17.13 mm |
| 7 | 17.35 mm |
| 7.25 | 17.45 mm |
| 7.5 | 17.75 mm |
| 7.75 | 17.97 mm |
| 8 | 18.19 mm |
| 8.25 | 18.35 mm |
| 8.5 | 18.53 mm |
| 8.75 | 18.69 mm |
| 9 | 18.89 mm |
| 9.25 | 19.22 mm |
| 9.5 | 19.41 mm |
| 9.75 | 19.62 mm |
| 10 | 19.84 mm |
| 10.25 | 20.02 mm |
| 10.5 | 20.20 mm |
| 10.75 | 20.44 mm |
| 11 | 20.68 mm |
| 11.25 | 20.85 mm |
| 11.5 | 21.08 mm |
| 11.75 | 21.24 mm |
| 12 | 21.49 mm |
| 12.5 | 21.89 mm |
| 13 | 22.33 mm |
| 13.5 | 22.60 mm |
| 14 | 23.01 mm |