Oval
Round
Pear
Emerald
Cushion
Marquise
Radiant
Trillion
Princess
Ring Size Conversion Guide
This ring size chart is based on our closest conversions. When in doubt, size 1/4 size up for a slightly looser fit and vice versa.
| US/Canada | Inside Diameter (mm) | Inside Circumference (mm) |
|---|---|---|
| 3 | 14.05mm | 44.14mm |
| 3 1/4 | 14.25mm | 44.77mm |
| 3 1/2 | 14.45mm | 45.40mm |
| 3 3/4 | 14.65mm | 46.02mm |
| 4 | 14.86mm | 46.68mm |
| 4 1/4 | 15.04mm | 47.25mm |
| 4 1/2 | 15.27mm | 47.97mm |
| 4 3/4 | 15.53mm | 48.79mm |
| 5 | 15.70mm | 49.32mm |
| 5 1/4 | 15.90mm | 49.95mm |
| 5 1/2 | 16.10mm | 50.58mm |
| 5 3/4 | 16.30mm | 51.21mm |
| 6 | 16.51mm | 51.87mm |
| 6 1/4 | 16.71mm | 52.50mm |
| 6 1/2 | 16.92mm | 53.16mm |
| 6 3/4 | 17.13mm | 53.82mm |
| 7 | 17.35mm | 54.51mm |
| 7 1/4 | 17.45mm | 54.82mm |
| 7 1/2 | 17.75mm | 55.76mm |
| 7 3/4 | 17.97mm | 56.45mm |
| 8 | 18.19mm | 57.15mm |
| 8 1/4 | 18.35mm | 57.65mm |
| 8 1/2 | 18.53mm | 58.21mm |
| 8 3/4 | 18.69mm | 58.72mm |
| 9 | 18.89mm | 59.34mm |
| 9 1/4 | 19.22mm | 60.38mm |
| 9 1/2 | 19.41mm | 60.98mm |
| 9 3/4 | 19.62mm | 61.64mm |
| 10 | 19.84mm | 62.33mm |
| 10 1/4 | 20.02mm | 62.89mm |
| 10 1/2 | 20.20mm | 63.46mm |
| 10 3/4 | 20.44mm | 64.21mm |
| 11 | 20.68mm | 64.97mm |
| 11 1/4 | 20.85mm | 65.50mm |
| 11 1/2 | 21.08mm | 66.22mm |
| 11 3/4 | 21.24mm | 66.73mm |
| 12 | 21.49mm | 67.51mm |
| 12 1/4 | 21.69mm | 68.14mm |
| 12 1/2 | 21.89mm | 68.77mm |
| 12 3/4 | 22.10mm | 69.43mm |
| 13 | 22.33mm | 70.15mm |
Choosing the right size can be tricky, there are some instances where you may have to size up or down. Learn more in our Size Guide Page.
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