Ring sizing
Find your fit.
A considered fit lets a ring become part of daily life. Choose the method that feels most certain.
01 — delivered to you
Complimentary at-home ring sizer
A practical way to measure at home before a made-to-order piece begins. Use the form below to prepare your request with a Private Client Concierge.
02 — measure now
Printable ring sizer
For an instant guide, print at 100% scale. Before measuring, place a credit card against the verification line on your printout: it should measure exactly 85.60 mm wide.
Print-scale verification
For the most dependable result, verify a printed guide against an existing ring or use the at-home sizer.
03 — use a ring they own
Measure an existing ring
Place a ring that already fits the intended finger on a ruler. Measure the inside edge to inside edge, not the outside of the band, then compare it to the chart below.
Measure the inside diameter
US conversion chart
Measure with confidence.
- Measure toward the end of the day, when fingers are naturally larger.
- Cold weather and temperature changes can affect fit.
- Consider the knuckle as well as the base of the finger.
- Wider bands often require a little more room.
- Fully-set eternity rings may have sizing restrictions.
| US size | Inside diameter | Inside circumference | Reference |
|---|---|---|---|
| 4 | 14.9 mm | 46.8 mm | Measure inside edge to inside edge |
| 4½ | 15.3 mm | 48.0 mm | Measure inside edge to inside edge |
| 5 | 15.7 mm | 49.3 mm | Measure inside edge to inside edge |
| 5½ | 16.1 mm | 50.6 mm | Measure inside edge to inside edge |
| 6 | 16.5 mm | 51.9 mm | Measure inside edge to inside edge |
| 6½ | 16.9 mm | 53.1 mm | Measure inside edge to inside edge |
| 7 | 17.3 mm | 54.4 mm | Measure inside edge to inside edge |
| 7½ | 17.7 mm | 55.7 mm | Measure inside edge to inside edge |
| 8 | 18.1 mm | 57.0 mm | Measure inside edge to inside edge |
| 8½ | 18.5 mm | 58.3 mm | Measure inside edge to inside edge |
| 9 | 18.9 mm | 59.5 mm | Measure inside edge to inside edge |
| 9½ | 19.4 mm | 60.8 mm | Measure inside edge to inside edge |
| 10 | 19.8 mm | 62.1 mm | Measure inside edge to inside edge |
The Perfect Fit Promise
Planning a surprise? We can help.
When eligible, Obsidian Valley offers one complimentary engagement-ring resizing within six months of delivery, generally within approximately three-quarter size up or down. Fully-set eternity and technically restricted designs can be excluded. Exact eligibility is shown on each piece before purchase and secure round-trip shipping depends on destination.
Talk through a surprise proposal