Ring Size Guide | Diamond Lab Australia
Find Your Perfect Fit
We work with standard Australian ring sizing. Wherever you are located in the world, refer to our international sizing chart below so you choose the right ring size. Choosing the right ring size is essential for comfort and confidence. Use our guide below to measure accurately at home, or contact our team for expert sizing advice.
International Ring Size Conversion Chart
| Inside Diameter (mm) | AUS / UK / NZ | US & Canada |
|---|---|---|
| 13.94 | F | 3 |
| 14.14 | F 1/2 | 3.25 |
| 14.34 | G | 3.5 |
| 14.54 | G 1/2 | 3.75 |
| 14.74 | H | 4 |
| 14.94 | H 1/2 | 4.25 |
| 15.14 | I | 4.5 |
| 15.34 | I 1/2 | 4.66 |
| 15.54 | J | 4.75 |
| 15.74 | J 1/2 | 5 |
| 15.94 | K | 5.25 |
| 16.14 | K 1/2 | 5.5 |
| 16.32 | L | 5.75 |
| 16.52 | L 1/2 | 6 |
| 16.72 | M | 6.25 |
| 16.92 | M 1/2 | 6.5 |
| 17.12 | N | 6.75 |
| 17.32 | N 1/2 | 7 |
| 17.52 | O | 7.25 |
| 17.72 | O 1/2 | 7.5 |
| 17.92 | P | 7.75 |
| 18.12 | P 1/2 | 8 |
| 18.32 | Q | 8.25 |
| 18.52 | Q 1/2 | 8.5 |
| 18.72 | R | 8.75 |
| 18.92 | R 1/2 | 9 |
| 19.12 | S | 9.25 |
| 19.32 | S 1/2 | 9.5 |
| 19.52 | T | 9.75 |
| 19.72 | T 1/2 | 10 |
| 19.92 | U | 10.25 |
| 20.10 | U 1/2 | 10.5 |
| 20.30 | V | 10.75 |
| 20.50 | V 1/2 | 11 |
| 20.70 | W | 11.25 |
| 20.90 | W 1/2 | 11.5 |
| 21.10 | X | 11.75 |
| 21.30 | X 1/2 | 12 |
| 21.50 | Y | 12.25 |
| 21.70 | Z | 12.5 |
Tips for Measuring
- Measure your finger at the end of the day when it’s warm for the most accurate fit.
- Your ring should slide over the knuckle with slight resistance and sit comfortably.
- If you're between two sizes, we recommend going for the larger size.
Need Assistance?
We double quality check all our jewellery. If you’re unsure about sizing, reach out to our team anytime via our Contact Page. We're happy to guide you.