Ring Size Help
At Diamond Rocks, we often get a lot of questions about ring size and how to calculate it. That’s why we offer a ring size guide that can help you find the right fit.
Method One
Take a piece of thread, ribbon, string, or a thin strip of paper and wrap it around your finger, close to the knuckle. Make a mark where the two pieces overlap, measure against a millimetre ruler and this should give you the circumference of your finger.
| Ring Size (UK) | Circumference (mm) | Ring Size (UK) | Circumference (mm) |
| A | 37.8 | N | 53.8 |
| B | 39.1 | O | 55.1 |
| C | 40.4 | P | 56.3 |
| D | 41.7 | Q | 57.6 |
| E | 42.9 | R | 58.9 |
| F | 44.2 | S | 60.2 |
| G | 45.5 | T | 61.4 |
| H | 46.8 | U | 62.7 |
| I | 48.0 | V | 64.0 |
| J | 48.7 | W | 65.3 |
| K | 50.0 | X | 66.6 |
| L | 51.2 | Y | 67.8 |
| M | 52.5 | Z | 68.5 |
- Make sure you're at a comfortable, normal temperature - Cold weather can cause your fingers to shrink by half a ring size, whereas hot weather, exercise, water retention caused by food, medication or illness can do the opposite.
- Measure the exact finger you want the ring for - This may sound obvious, but the fingers on your dominant hand are larger than on your non-dominant hand, so don't assume the measurements will be the same.
- Consider the width of the band - If you're looking for a ring with a deep band width, it will be tighter than a ring on a finer band and you may have to go for one size larger to accommodate.
Method Two
We can send you a free plastic ring sizer (as shown below) in the post. All you have to do is fill in the details in this form:
Method Three
If you're still uncertain about yours or your partner's finger size, and you want a quick way to calculate it, you can download our printable ring strap sizer for an accurate indication.
