JJ Jewelry · US Sizing
Ring Size Guide
Three ways to find your ring size at home, plus the JJ size chart. If you're between sizes or unsure, our GIA-certified concierge can help you get it right the first time.
How to measure at home
Cut a thin strip of paper or use a piece of string, approximately 10 cm long.
Wrap it snugly around the base of the finger you'll wear the ring on. It should fit comfortably, not too tight, not too loose.
Mark where the paper overlaps with a pen, then lay it flat against a ruler. Note the measurement in millimeters.
Find your measurement in the Size Table tab above.
Measure an existing ring
Find a ring that fits the intended finger well. One you wear regularly works best.
Place it flat on a ruler and measure the inside diameter (the empty space across the center) in millimeters.
Find your diameter in the size table. If your measurement falls between two sizes, choose the larger size.
US size chart
| US Size | Circumference (mm) | Diameter (mm) |
|---|---|---|
| 4 | 46.8 | 14.9 |
| 4.5 | 48.0 | 15.3 |
| 5 | 49.3 | 15.7 |
| 5.5 | 50.6 | 16.1 |
| 6 Most common | 51.9 | 16.5 |
| 6.5 Most common | 53.1 | 16.9 |
| 7 Most common | 54.4 | 17.3 |
| 7.5 | 55.7 | 17.7 |
| 8 | 57.0 | 18.1 |
| 8.5 | 58.3 | 18.5 |
| 9 | 59.5 | 18.9 |
| 9.5 | 60.8 | 19.4 |
| 10 | 62.1 | 19.8 |
Chat with our GIA-certified specialist. We'll get it right the first time.