Jewelry Size Guide
Find the right fit for your next Jewel Frost piece. Use our guide to measure for rings, bracelets and necklaces, and check the available sizes and dimensions on each product page.
Unsure which size to choose? Contact us with the product link and your measurements before ordering.
International Ring Size Guide
Know your size from another country? Use the chart below as a starting point, then compare it with the size options on your chosen piece.
International sizes are approximate equivalents. A country name alone may not identify the sizing system your jeweler used. If your size is missing or falls between rows, send us your size, country and product link before ordering. For the most dependable fit, have a jeweler measure the intended finger with a sizer similar in width to your ring.
On mobile, swipe the table sideways to see every column. Sizes shown are references, not a list of sizes available for every design.
| US / Canada | Inside circumference (mm) | Approx. inside diameter (mm) | UK / Australia | France | Japan | Italy |
|---|---|---|---|---|---|---|
| 3 | 44.2 | 14.1 | F | 44 | 4 | 4 |
| 3.5 | 45.5 | 14.5 | G | 45.5 | 5 | 5 1/4 |
| 4 | 46.8 | 14.9 | H | 47 | 7 | 6 1/2 |
| 4.5 | 48 | 15.3 | I | 48 | 8 | 7 3/4 |
| 5 | 49.3 | 15.7 | J 1/2 | 49 | 9 | 9 |
| 5.5 | 50.6 | 16.1 | K 1/2 | 50.5 | 10 | 10 1/4 |
| 6 | 51.9 | 16.5 | L 1/2 | 52 | 12 | 11 1/2 |
| 6.5 | 53.1 | 16.9 | M 1/2 | 53 | 13 | 12 3/4 |
| 7 | 54.4 | 17.3 | N 1/2 | 54.5 | 14 | 14 |
| 7.5 | 55.7 | 17.7 | O 1/2 | 56 | 15 | 15 1/4 |
| 8 | 57 | 18.1 | P 1/2 | 57 | 16 | 16 1/2 |
| 8.5 | 58.3 | 18.6 | Q 1/2 | 58.5 | 17 | 17 3/4 |
| 9 | 59.5 | 18.9 | R 1/2 | 60 | 18 | 19 |
| 9.5 | 60.8 | 19.4 | S 1/2 | 61 | 19 | 20 1/4 |
| 10 | 62.1 | 19.8 | T 1/2 | 62 | 20 | 21 1/2 |
| 10.5 | 63.4 | 20.2 | U 1/2 | 63.5 | 22 | 22 3/4 |
| 11 | 64.6 | 20.6 | V 1/2 | 65 | 23 | 24 |
| 11.5 | 65.9 | 21.0 | W 1/2 | 66 | 24 | 25 1/4 |
| 12 | 67.2 | 21.4 | X 1/2 | 67.5 | 25 | 26 1/2 |
| 12.5 | 68.5 | 21.8 | Z | 69 | 26 | 27 3/4 |
| 13 | 69.7 | 22.2 | — | 70 | 27 | 29 |
Read the units carefully: circumference measures around the inside of a ring; diameter measures straight across its center. These are different measurements. For example, a US 7 has a reference inside circumference of 54.4 mm and an approximate inside diameter of 17.3 mm.
US sizes, circumference and international labels: Brilliant Earth ring size conversion chart, checked September 16, 2026. Selected whole and half US sizes. Approximate diameters calculated from the published circumference divided by π, rounded to 0.1 mm. These are reference measurements, not manufacturing tolerances.
Measure a Ring You Already Own
- Choose a round ring that fits the same finger on the same hand.
- Measure straight across the center of the opening in millimeters, from inside edge to inside edge. Do not include the metal.
- Compare the measurement with the approximate diameter column. A household ruler gives only an estimate; have a jeweler confirm if the measurement falls between sizes.
Do not use the illustration as an actual-size ring template. Screens and printers can change its size.
Questions About International Sizes
My country is not listed. How do I choose?
Email your existing ring size, the country or jeweler that measured it, and the product link. If possible, include the inside circumference or diameter in millimeters and clearly state which measurement it is. We can help you check the appropriate size.
Can I treat an Indian, Chinese or Hong Kong size as a Japanese size?
Please confirm the actual sizing system first. Do not assume that the same number from different countries represents the same fit. Send us the original size information or ask your jeweler for the measurement in millimeters.
Why does another chart show a different conversion?
Charts can use different rounding and conventions when matching systems. Use one reference consistently and confirm your fit with a physical sizer, especially for wide bands, stacked rings and custom pieces.
What if I am between sizes?
Avoid choosing solely from a rounded conversion. The band width, your knuckle and the ring design affect fit. Contact us with the product link and your measurements before ordering.
Bracelet & Necklace Lengths
For lengths, 1 inch equals exactly 2.54 cm. Measure your preferred fit and check the product description for available lengths, extenders and clasp details. A bracelet's listed length is not necessarily the same as your wrist measurement.
| Length in inches | Length in centimeters |
|---|---|
| 6 | 15.24 |
| 6.5 | 16.51 |
| 7 | 17.78 |
| 7.5 | 19.05 |
| 8 | 20.32 |
| 8.5 | 21.59 |
| 9 | 22.86 |
| 14 | 35.56 |
| 16 | 40.64 |
| 18 | 45.72 |
| 20 | 50.80 |
| 22 | 55.88 |
| 24 | 60.96 |
Lengths are conversions only; availability and fit vary by design.
Need Help Choosing?
Email info@jewel-frost.com with your product link, existing size and sizing system, measurements, and preferred fit.