Choosing the right ring size is important for a comfortable and secure fit. For the most accurate result, we recommend having your finger professionally measured by a jeweller.
If you already own a ring that fits the intended finger comfortably, you can find your size in three simple steps:
Australian and British sizes use letters (A–Z), while US sizing uses numbers. Use the inside diameter (mm) as your primary reference.
| AU / UK Size | US Size | Inside Diameter (mm) | Inside Circumference (mm) |
|---|---|---|---|
| H | 4 | 14.9 mm | 46.8 mm |
| I | 4.5 | 15.3 mm | 48.0 mm |
| J | 5 | 15.7 mm | 49.3 mm |
| K | 5.5 | 16.1 mm | 50.6 mm |
| L | 6 | 16.5 mm | 51.9 mm |
| M | 6.5 | 16.9 mm | 53.1 mm |
| N | 7 | 17.3 mm | 54.4 mm |
| O | 7.5 | 17.7 mm | 55.7 mm |
| P | 8 | 18.1 mm | 57.0 mm |
| Q | 8.5 | 18.5 mm | 58.3 mm |
| R | 9 | 18.9 mm | 59.5 mm |
| S | 9.5 | 19.4 mm | 60.8 mm |
| T | 10 | 19.8 mm | 62.1 mm |
| U | 10.5 | 20.2 mm | 63.4 mm |
| V | 11 | 20.6 mm | 64.6 mm |
| W | 11.5 | 21.0 mm | 65.9 mm |
| X | 12 | 21.4 mm | 67.2 mm |
| Y | 12.5 | 21.8 mm | 68.5 mm |
| Z | 13 | 22.2 mm | 69.7 mm |
* International size conversions are approximate and may vary slightly between sizing standards. Inside diameter should be used as the primary measurement reference.
Already have a ring that fits? Print our official Ring Size Guide to place your existing ring directly over actual-size circles and confirm your perfect fit.
DOWNLOAD PRINTABLE GUIDE (PDF)We want your Arlena piece to fit seamlessly. If your ring isn't quite the right fit upon arrival, we offer a complimentary first resize within 30 days of delivery on all eligible rings.