1. Select an existing ring that fits the desired finger.
2. Measure the internal diameter of the ring (in mm).
3. Use the below chart to determine your ring size.
Download Guide
Use the helpful conversion chart below to see which US & Canada size you'd wear.
| Internal Diameter (MM) | USA & Canada |
Adjustable Rings | Europe | UK/AU |
|---|---|---|---|---|
| 15.7 | 5 | S | 50 | J |
| 16.5 | 6 | S | 52 | L |
| 17.3 | 7 | M | 55 | N |
| 18.1 | 8 | M | 57 | P |
| 18.9 | 9 | L | 60 | R |
| 19.8 | 10 | L | 62 | T |
| 20.6 | 11 | - | 64 | V |
| 21.5 | 12 | - | 67 | X |
| 22.3 | 13 | - | 69 | Z |
Our Moon Magic sizes match standard US/CAN sizes.
Still not sure how to measure your ring?
No worries, we got you covered!
Check out our video.
If you are in between sizes or would love a more versatile piece, why not explore our adjustable rings. Shop the Boundless collection.
