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Don't forget that we offer free ring re-sizing for life on all of our rings. Find your ring size
Here are some tips to find out your ring size:
Measure your finger in warm temperatures at the end of the day.
If your knuckle is a lot larger than the base of your finger, you can either measure both the base of your finger and your knuckle and select a size in between the two, or use the method below
Measure your finger and compare to the chart:
- Find a piece of non-stretchy string about 6 inches long, or a strip of paper about 6 inches long and a quarter inch wide.
- Wrap it well around the base of your finger.
- Using a pen, mark the point on the string or paper where it folds over, forming a complete circle. This gives you the circumference in millimeters.
- See the chart below to find your ring size.
| U.K. | USA / CND | Diameter (in millimeters) | Circumference (in millimeters) |
| F | 23/4 | 13.7 | 43.65 |
| G | 31/4 | 14.3 | 44.90 |
| H | 4 | 14.7 | 46.20 |
| I | 41/2 | 15.1 | 47.45 |
| J | 43/4 | 15.5 | 48.70 |
| K | 51/2 | 15.9 | 49.95 |
| L | 53/4 | 16.3 | 51.25 |
| M | 61/4 | 16.7 | 52.45 |
| N | 63/4 | 17.1 | 53.70 |
| O | 71/4 | 17.5 | 55.00 |
| P | 73/4 | 17.9 | 56.25 |
| Q | 8 | 18.3 | 57.50 |
| R | 83/4 | 18.7 | 58.75 |
| S | 91/4 | 19.1 | 60.00 |
| T | 93/4 | 19.5 | 61.25 |
| U | 10 | 19.9 | 62.50 |
| V | 101/2 | 20.3 | 63.75 |
| W | 11 | 20.7 | 65.00 |
| X | 111/2 | 21.1 | 66.30 |
| Y | 12 | 21.5 | 67.50 |
| Z | 121/2 | 21.9 | 68.75 |
Here are some tips if you’re buying the ring as a surprise:
Ask your partner's mother, sister, or one of her friends if they know her finger size.
Borrow one of her rings making sure it corresponds to the engagement finger and measure either the diameter or circumference in mm. If you can’t find your exact size with the chart at the bottom of this page, simply let us know either the diameter or circumference in mm and we will gladly tell you your ring size.
What if it’s not the correct size?
For your peace of mind, Diamond Manufacturers provides free lifetime resizing. You can return your item to us at any time for professional resizing. We appreciate that no one likes to be without their ring so we promise to return this to you with a next day delivery service.
More Tips and Guidance
- Your ring size will be about half a size larger on your primary hand (i.e. the hand you write with).
- The average ladies ring size is about M.
- When considering a wide band, move up a size from your measurement, for comfort’s sake.
- Measure the fingers in the afternoon or evening when they are at their largest size.
- Cold fingers are smaller than warm fingers.
- Some factors which can affect ring size include: the menstrual cycle, temperature, humidity, water-retention and exercise.
- Large knuckles/hands should wear a slightly loose ring, while slimmer knuckles/smaller hands will require a tighter ring.
- If you wear a half size and a ring is not available in the half sizes, choose the next size larger.
- Different countries use different ring size systems.
- In Ireland, the United Kingdom and Australia, ring sizes are specified using an alphabetical scale, with half sizes.
- In Europe (excluding Ireland and the United Kingdom), ring sizes are specified using a numerical scale, with half sizes.
- In the United States and Canada, ring sizes are specified using a numerical scale, with quarter and half sizes.
