Inside diameter
Method 1
Measure a ring that fits
Choose a ring that fits the same finger. Measure straight across the inside opening, edge to edge, in millimetres.
The Cantemiri guide
Find your ring size.
Use a ring you already own or measure your finger, then match the measurement to our US ring sizes.
Sizing systemUS ring sizes
Available guideUS 5–13
MeasurementsMillimetres
01
Find your size
Enter one measurement and we’ll show the closest size in our guide.
Size chart
Match your measurement to the nearest US size.
| US size | Inside diameter mm | Circumference mm |
|---|---|---|
| 5 | 15.7 | 49.3 |
| 6 | 16.5 | 51.9 |
| 7 | 17.3 | 54.4 |
| 8 | 18.1 | 57.0 |
| 9 | 18.9 | 59.5 |
| 10 | 19.8 | 62.1 |
| 11 | 20.6 | 64.6 |
| 12 | 21.4 | 67.2 |
| 13 | 22.2 | 69.7 |
Measurements are approximate. Check the sizes offered on the individual product before ordering.
02
How to measure
Choose the method that is easiest for you.
Circumference
Method 2
Measure your finger
Wrap a narrow strip of paper around the base of your finger, mark where it meets, lay it flat and measure the length in millimetres. Keep it snug, not tight.
03
A better fit
A few small details can make your measurement more reliable.
Measure the exact finger you plan to wear the ring on — the same finger can differ between hands.
Measure when your hands are comfortably warm, and repeat the measurement to confirm it.
If you are between sizes or choosing a wider band, a slightly roomier fit may feel better.
Personal customer care
Still unsure?
Send us the ring you’re considering and your measurement. We’ll help you choose with confidence.