Celebrity-quality diamonds.
Insider prices.
Method 1: Measure an Existing Ring
- 1Select a ring that fits comfortably on the finger you want to measure.
- 2Measure the inside diameter of the ring in millimeters.
- 3Use the chart below to find your US ring size.
Method 2: Measure Your Finger
- 1Cut a thin strip of paper or use a piece of string.
- 2Wrap it around the base of your finger (where the ring would sit).
- 3Mark where the paper/string overlaps.
- 4Measure the length in millimeters — this is your circumference.
- 5Use the chart below to find your US ring size.
Ring Size Chart
| US Size | Diameter (mm) | Circumference (mm) |
|---|---|---|
| 4 | 14.9 | 46.8 |
| 4.5 | 15.3 | 48.0 |
| 5 | 15.7 | 49.3 |
| 5.5 | 16.1 | 50.6 |
| 6 | 16.5 | 51.9 |
| 6.5 | 16.9 | 53.1 |
| 7 | 17.3 | 54.4 |
| 7.5 | 17.7 | 55.7 |
| 8 | 18.1 | 56.9 |
| 8.5 | 18.5 | 58.2 |
| 9 | 18.9 | 59.5 |
| 9.5 | 19.4 | 60.8 |
| 10 | 19.8 | 62.1 |
| 10.5 | 20.2 | 63.4 |
| 11 | 20.6 | 64.6 |
| 11.5 | 21.0 | 65.9 |
| 12 | 21.4 | 67.2 |
| 12.5 | 21.8 | 68.5 |
| 13 | 22.2 | 69.7 |
Helpful Tips
- • Measure your finger at the end of the day when it's at its largest.
- • Avoid measuring when your hands are cold — fingers shrink in cold weather.
- • If you're between sizes, we recommend going up to the larger size.
- • Consider the width of the ring — wider bands typically require a larger size.
- • If you're unsure, order a ring sizer kit or visit a local jeweler.
Free Resizing Available
Don't worry if you're not 100% sure — we offer complimentary resizing within 30 days of purchase on all Nitzi rings.