Ring Size Guide
Find Your Ring Size.
Measure the inner diameter of a ring you already wear, or use the guide below. We will recommend your ideal size in both US and European conventions.
How to Measure
Three ways to find your size, from easiest to most accurate.
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Check for an Engraved Size
Many Nouvel Heritage rings have the size engraved on the inside of the band. Hold it in good light and look closely — the smallest measurement is often there.
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Measure the Inner Diameter
Place a flat, band-style ring on a millimeter ruler and measure across the inside from edge to edge. Wider or high-profile rings may require going up half a size for comfort over the knuckle.
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Match It to the Chart
Enter your measurement in the calculator below, or use our printable chart to compare against a ring you already own.
What Is Your Ring Measurement?
Choose what you have measured and enter the value in millimeters. We will match it to the closest size.
No ruler? Wrap a thin strip of paper around the base of your finger, mark where it meets, and measure the length in millimeters — that is your circumference.
Could also fit
Ring Size Chart
| US | EU | Inner diameter | Inner circumference |
|---|---|---|---|
| 3 | 44 | 14.0 mm | 44 mm |
| 3.5 | 45 | 14.4 mm | 45 mm |
| 4 | 46 | 14.8 mm | 46 mm |
| 4.5 | 47 | 15.2 mm | 48 mm |
| 5 | 49 | 15.7 mm | 49 mm |
| 5.5 | 50 | 16.1 mm | 51 mm |
| 6 | 51 | 16.5 mm | 52 mm |
| 6.5 | 53 | 16.9 mm | 53 mm |
| 7 | 54 | 17.3 mm | 54 mm |
| 7.5 | 55 | 17.7 mm | 56 mm |
| 8 | 57 | 18.2 mm | 57 mm |
| 8.5 | 58 | 18.6 mm | 58 mm |
| 9 | 59 | 19.0 mm | 60 mm |
| 9.5 | 61 | 19.4 mm | 61 mm |
| 10 | 62 | 19.8 mm | 62 mm |
| 10.5 | 63 | 20.2 mm | 64 mm |
| 11 | 65 | 20.6 mm | 65 mm |
| 11.5 | 66 | 21.0 mm | 66 mm |
| 12 | 67 | 21.4 mm | 67 mm |
| 12.5 | 69 | 22.0 mm | 69 mm |
How to Know It Fits
- It slides on with slight resistance over your knuckle.
- It sits comfortably at the base of your finger, without pinching.
- It feels secure with gentle rotation, but never slips off on its own.
Finger size fluctuates with temperature, time of day, and activity — and your dominant hand is often slightly larger. Measure a few times, at different moments, for the most reliable read.
Complimentary Size Exchange
If your ring does not fit perfectly, we offer a complimentary size exchange on eligible pieces within our exchange window.
Engraved rings and rings that show signs of wear are not eligible. Contact our client advisors for assistance with your exchange.