Ring Size Guide
Finding your size
All ring sizes at Auryn Jewels are listed in US sizing (US 4 to US 17). Some pieces are marked Adjustable — these have an open band that flexes to fit most fingers, so no measuring needed.
Measure at home in two minutes
You'll need a strip of paper or a piece of string, a pen and a ruler.
- Wrap the paper snugly around the base of your finger — firm, but not tight enough to leave a mark.
- Mark where the ends overlap.
- Lay it flat and measure the length in millimetres.
- Find your measurement in the chart below.
A few things that help
- Measure at the end of the day. Fingers are smallest in the morning and swell slightly by evening — you want the ring to fit then too.
- Avoid measuring when your hands are cold, they shrink.
- Wide bands sit tighter than thin ones. If your ring is 6mm or wider, go half a size up.
- Between two sizes? Choose the larger one. A slightly loose ring can be worn on another finger; a tight one can't be worn at all.
Size chart
| Inner circumference | US size | UK size | EU size |
|---|---|---|---|
| 46.8 mm | US 4 | H½ | 47 |
| 48.0 mm | US 4.5 | I½ | 48 |
| 49.3 mm | US 5 | J½ | 49 |
| 50.6 mm | US 5.5 | K½ | 50 |
| 51.9 mm | US 6 | L½ | 52 |
| 53.1 mm | US 6.5 | M½ | 53 |
| 54.4 mm | US 7 | N½ | 54 |
| 55.7 mm | US 7.5 | O½ | 56 |
| 57.0 mm | US 8 | P½ | 57 |
| 58.3 mm | US 8.5 | Q½ | 58 |
| 59.5 mm | US 9 | R½ | 59 |
| 60.8 mm | US 9.5 | S½ | 61 |
| 62.1 mm | US 10 | T½ | 62 |
| 63.4 mm | US 10.5 | U½ | 63 |
| 64.6 mm | US 11 | V½ | 65 |
| 65.9 mm | US 11.5 | W½ | 66 |
| 67.2 mm | US 12 | X½ | 67 |
| 68.5 mm | US 12.5 | Y½ | 68 |
| 69.7 mm | US 13 | Z½ | 70 |
| 71.0 mm | US 14 | — | 71 |
| 73.6 mm | US 15 | — | 74 |
| 76.2 mm | US 16 | — | 76 |
| 78.7 mm | US 17 | — | 79 |
Conversions follow the international ISO 8653 standard and are provided as a guide. Measurements can vary slightly between makers.
Still not sure?
Email us at info@auryn-jewels.co.uk with your measurement and the ring you're looking at — we'll help you choose. And if a ring doesn't fit when it arrives, just let us know within 30 days.