Ring Sizing Chart & Guide

How to measure your ring size
-
Measure the inside diameter of your existing rings (the distance across the center of the ring) with a ruler and check it against our ring sizing chart
- Order a ring sizer from us and follow this video guide to learn how to measure your ring size.
Tips for Accurate Measurement
- Measure at the end of the day when your fingers are at their largest, or measure multiple times a day just to be sure.
- Avoid measuring when your hands are too cold or too warm, as temperatures can affect finger size.
- Ensure the ring is snug but comfortable—it should slide over your knuckle without being too loose.
International Ring Sizing Conversion Chart
Note: We use US sizing on our product listings, but you can always send us your ring size on another metric system and we can convert it for you.
| Circumference (mm) | Diameter (mm) | Europe | United States/ Canada | UK / Australia | Singapore / Japan | Hong Kong |
|---|---|---|---|---|---|---|
| 44.2 | 14.1 | 44 | 3 | F½ | 4 | 6 |
| 44.8 | 14.3 | 45 | 3½ | G | 5 | |
| 45.5 | 14.5 | 4 | G½ | 7.5 | ||
| 46.1 | 14.7 | 46 | H | 6 | ||
| 46.8 | 14.9 | 47 | H½ | 7 | 9 | |
| 47.4 | 15.1 | I | ||||
| 48.0 | 15.3 | 48 | 4½ | I½ | 8 | 10 |
| 48.7 | 15.5 | 49 | 5 | J | ||
| 50.0 | 15.9 | 50 | 5½ | K | 8 | 10 |
| 51.2 | 16.3 | 51 | L | |||
| 51.9 | 16.5 | 52 | 6 | L½ | 11 | 13 |
| 52.5 | 16.7 | M | 12 | |||
| 53.1 | 16.9 | 53 | 6½ | M½ | 13 | 14.5 |
| 53.8 | 17.1 | N | ||||
| 54.4 | 17.3 | 54 | 7 | N½ | 14 | 16 |
| 55.1 | 17.5 | 55 | O | |||
| 55.7 | 17.7 | 7½ | O½ | 15 | 17 | |
| 56.3 | 17.9 | 56 | P | |||
| 57.0 | 18.1 | 57 | 8 | P½ | 16 | |
| 57.2 | 18.2 | 18 | ||||
| 57.6 | 18.3 | Q | ||||
| 58.3 | 18.5 | 58 | 8½ | Q½ | 17 | 19 |
| 58.9 | 18.8 | 59 | R | |||
| 59.5 | 19.0 | 9 | R½ | 18 | 20½ | |
| 60.2 | 19.2 | 60 | S | |||
| 60.8 | 19.4 | 61 | 9½ | S½ | 19 | 22 |
| 61.4 | 19.6 | T | ||||
| 62.1 | 19.8 | 62 | 10 | T½ | 20 | 23 |

skip carousel


Sale
Featured

From$1,922.00 USD$1,378.00 USD
Featured

From$2,000.00 USD
Learn More About Diamonds
Gifts for the Nice List: A Complimentary Flower Matters Bouquet This Holiday Season
14 days ago
This holiday season, every qualifying order from Carat Heritage arrives with a complimentary Flower Matters bouquet: fresh blooms, delivered alongside your jewellery.

Featured on Expat Living
Proud to be featured in Expat Living, October 2026 edition. Learn the story behind the brand, the founders and our process.
15 Iconic Celebrity Diamond Rings
From Zendaya to Selena Gomez, explore 15 iconic celebrity engagement rings — the cuts, carats, and stories behind them, and how to get the look.









