Ring Sizing
O N Y X R I N G
Find your size in 60 seconds
This chart is calibrated to how the Onyx actually fits — snug, for accurate tracking. Measure once, order with confidence.
① FASTEST — A RING YOU OWN
Take a ring that fits that finger. Measure the inside width in mm with a ruler. Match it in the right column below.
② NO RING? PAPER STRIP
Wrap a thin strip of paper or string snugly around the base of your finger. Mark the overlap, measure the mm, match the left column.
💡 Measure at the end of the day, when fingers are largest. Cold hands run about half a size small.
| SIZE | YOUR FINGER CIRCUMFERENCE | …OR A RING YOU OWN (INNER Ø) |
|---|---|---|
| 7 | up to 56.7 mm | up to 18.0 mm |
| 8 | 56.8–59.7 mm | 18.1–19.0 mm |
| 9 | 59.8–62.5 mm | 19.0–19.9 mm |
| 10 | 62.6–66.2 mm | 19.9–21.1 mm |
| 11 | 66.3–67.9 mm | 21.1–21.6 mm |
| 12 | 68.0–71.9 mm | 21.6–22.9 mm |
| 13 | 72.0 mm + | 22.9 mm + |
Right between two sizes? Under 64 mm, take the larger size — a ring you can’t get over your knuckle is useless. 64 mm or more, take the smaller — a loose ring spins and misreads. Under 54 mm, our smallest size (7) will sit loose.
The right fit, in one sentence
Snug at the base, a little resistance over the knuckle, and when you make a fist there's no gap between the ring and your finger.
Fits sizes 7 and up. Most people nail it first try with the chart above.
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