Ring Size Guide
A comfortable fit is a small detail you will appreciate every day. Start with the finger where the ring will be worn and the style of band you plan to choose.
Begin with a professional fitting
A jeweler's sizing rings provide a better starting point than string or a paper strip. Those materials can stretch or distort and do not show how a ring moves over your knuckle. Bring a well-fitting ring for the same finger if you have one.
Measure the inside of an existing ring
For an initial estimate, measure the inside diameter straight across the center in millimeters, leaving out the metal. Use a ring that fits the intended finger. A ruler reading is only an estimate; even a small difference can change the size.
A quick U.S. size reference
These rounded measurements follow GIA's chart. International conversions and sizing tools may differ slightly. Confirm the sizing system on the item before ordering.
| U.S. / Canada | Inside diameter (mm) | Inside circumference (mm) |
|---|---|---|
| 4 | 14.9 | 46.8 |
| 5 | 15.7 | 49.3 |
| 6 | 16.5 | 51.8 |
| 7 | 17.3 | 54.3 |
| 8 | 18.1 | 56.9 |
| 9 | 19.0 | 59.7 |
| 10 | 19.8 | 62.2 |
For other sizes and international comparisons, use the linked GIA chart below as a starting reference and have the fit checked before purchase.
Think about the finished ring
Band width and profile affect comfort, and a stack can feel different from a single ring. Ask to try a sizer close to the width you want. A good fitting should account for both the base of the finger and the knuckle.
Before a surprise proposal
A ring already worn on the intended finger can help a jeweler estimate size. Ask about resizing possibilities before purchase: stone placement, material, and construction can limit changes. Availability, cost, and timing depend on the specific ring.