Visit a jeweller
The most reliable size comes from a local jeweller using a steel ring sizer. Copper and plastic sizers can read slightly off.
Once you have chosen the gemstone and the ring design, tell us the size so the ring is made to fit. A gemstone ring should sit so the stone rests against the skin, which is why a careful measurement matters.
The most reliable size comes from a local jeweller using a steel ring sizer. Copper and plastic sizers can read slightly off.
Match a plain band that fits the same finger to the chart below. Measure the inside diameter in millimetres, then find that row.
Wrap a strip of paper around the finger, mark where it meets, and measure that length in millimetres. That is the circumference. Divide by 3.14 for the diameter. This method often runs large, so confirm with a jeweller before you order a gem ring.
Pick a size in any column. The other scales update to the matching fit.
| Inside diameter | Inside circumference | US & Canada | UK, Ireland, Australia & NZ | China, Japan & South America | India | Italy, Spain, Netherlands & Switzerland | ||
|---|---|---|---|---|---|---|---|---|
| in | mm | in | mm | |||||
| 0.458 | 11.63 | 1.44 | 36.5 | 0 | — | — | — | — |
| 0.466 | 11.84 | 1.46 | 37.2 | ¼ | — | — | — | — |
| 0.474 | 12.04 | 1.49 | 37.8 | ½ | A | — | — | — |
| 0.482 | 12.24 | 1.51 | 38.5 | ¾ | A½ | — | — | — |
| 0.49 | 12.45 | 1.54 | 39.1 | 1 | B | 1 | — | — |
| 0.498 | 12.65 | 1.56 | 39.7 | 1¼ | B½ | — | — | — |
| 0.506 | 12.85 | 1.59 | 40.4 | 1½ | C | — | — | 0.5 |
| 0.514 | 13.06 | 1.61 | 41 | 1¾ | C½ | — | 1 | 1 |
| 0.522 | 13.26 | 1.64 | 41.7 | 2 | D | 2 | 2 | 1.75 |
| 0.53 | 13.46 | 1.67 | 42.3 | 2¼ | D½ | — | — | 2.25 |
| 0.538 | 13.67 | 1.69 | 42.9 | 2½ | E | 3 | 3 | 3 |
| 0.546 | 13.87 | 1.72 | 43.6 | 2¾ | E½ | — | 4 | 3.5 |
| 0.554 | 14.07 | 1.74 | 44.2 | 3 | F | 4 | — | 4.25 |
| 0.562 | 14.27 | 1.77 | 44.8 | 3¼ | F½ | 5 | 5 | 4.75 |
| 0.57 | 14.48 | 1.79 | 45.5 | 3½ | G | — | — | 5.5 |
| 0.578 | 14.68 | 1.82 | 46.1 | 3¾ | G½ | 6 | 6 | 6 |
| 0.586 | 14.88 | 1.84 | 46.8 | 4 | H | 7 | — | 6.75 |
| 0.594 | 15.09 | 1.87 | 47.4 | 4¼ | H½ | — | 7 | 7.5 |
| 0.602 | 15.29 | 1.89 | 48 | 4½ | I | 8 | 8 | 8 |
| 0.61 | 15.49 | 1.92 | 48.7 | 4¾ | J | — | 9 | 8.75 |
| 0.618 | 15.7 | 1.94 | 49.3 | 5 | J½ | 9 | — | 9.25 |
| 0.626 | 15.9 | 1.97 | 50 | 5¼ | K | — | 10 | 10 |
| 0.634 | 16.1 | 1.99 | 50.6 | 5½ | K½ | 10 | — | 10.5 |
| 0.642 | 16.31 | 2.02 | 51.2 | 5¾ | L | — | 11 | 11.25 |
| 0.65 | 16.51 | 2.04 | 51.9 | 6 | L½ | 11 | 12 | 11.75 |
| 0.658 | 16.71 | 2.07 | 52.5 | 6¼ | M | 12 | — | 12.5 |
| 0.666 | 16.92 | 2.09 | 53.1 | 6½ | M½ | 13 | 13 | 13.25 |
| 0.674 | 17.12 | 2.12 | 53.8 | 6¾ | N | — | — | 13.75 |
| 0.682 | 17.32 | 2.14 | 54.4 | 7 | N½ | 14 | 14 | 14.5 |
| 0.69 | 17.53 | 2.17 | 55.1 | 7¼ | O | — | 15 | 15 |
| 0.698 | 17.73 | 2.19 | 55.7 | 7½ | O½ | 15 | — | 15.75 |
| 0.706 | 17.93 | 2.22 | 56.3 | 7¾ | P | — | 16 | 16.25 |
| 0.714 | 18.14 | 2.24 | 57 | 8 | P½ | 16 | 17 | 17 |
| 0.722 | 18.34 | 2.27 | 57.6 | 8¼ | Q | — | — | 17.5 |
| 0.73 | 18.54 | 2.29 | 58.3 | 8½ | Q½ | 17 | 18 | 18.25 |
| 0.738 | 18.75 | 2.32 | 58.9 | 8¾ | R | — | 19 | 19 |
| 0.746 | 18.95 | 2.34 | 59.5 | 9 | R½ | 18 | — | 19.5 |
| 0.754 | 19.15 | 2.37 | 60.2 | 9¼ | S | — | 20 | 20.25 |
| 0.762 | 19.35 | 2.39 | 60.8 | 9½ | S½ | 19 | 21 | 20.75 |
| 0.77 | 19.56 | 2.42 | 61.4 | 9¾ | T | — | — | 21.5 |
| 0.778 | 19.76 | 2.44 | 62.1 | 10 | T½ | 20 | 22 | 22 |
| 0.786 | 19.96 | 2.47 | 62.7 | 10¼ | U | 21 | 23 | 22.75 |
| 0.794 | 20.17 | 2.49 | 63.4 | 10½ | U½ | 22 | — | 23.25 |
| 0.802 | 20.37 | 2.52 | 64 | 10¾ | V | — | 24 | 24 |
| 0.81 | 20.57 | 2.54 | 64.6 | 11 | V½ | 23 | 25 | 24.75 |
| 0.818 | 20.78 | 2.57 | 65.3 | 11¼ | W | — | — | 25.25 |
| 0.826 | 20.98 | 2.59 | 65.9 | 11½ | W½ | 24 | 26 | 26 |
| 0.834 | 21.18 | 2.62 | 66.6 | 11¾ | X | — | — | 26.5 |
| 0.842 | 21.39 | 2.65 | 67.2 | 12 | X½ | 25 | 27 | 27.25 |
| 0.85 | 21.59 | 2.67 | 67.8 | 12¼ | Y | — | 28 | 27.75 |
| 0.858 | 21.79 | 2.7 | 68.5 | 12½ | Z | 26 | — | 28.5 |
| 0.866 | 22 | 2.72 | 69.1 | 12¾ | Z½ | — | 29 | 29 |
| 0.874 | 22.2 | 2.75 | 69.7 | 13 | — | — | 30 | 29.75 |
| 0.882 | 22.4 | 2.77 | 70.4 | 13¼ | Z1 | — | — | 30.5 |
| 0.89 | 22.61 | 2.8 | 71 | 13½ | — | — | 31 | 31 |
| 0.898 | 22.81 | 2.82 | 71.7 | 13¾ | Z2 | — | 32 | 31.75 |
| 0.906 | 23.01 | 2.85 | 72.3 | 14 | Z3 | — | — | 32.25 |
| 0.914 | 23.22 | 2.87 | 72.9 | 14¼ | — | — | 33 | 33 |
| 0.922 | 23.42 | 2.9 | 73.6 | 14½ | Z4 | — | — | 33.5 |
| 0.93 | 23.62 | 2.92 | 74.2 | 14¾ | — | — | 34 | 34.25 |
| 0.938 | 23.83 | 2.95 | 74.8 | 15 | — | — | 35 | 34.75 |
| 0.946 | 24.03 | 2.97 | 75.5 | 15¼ | — | — | — | 35.5 |
| 0.954 | 24.23 | 3 | 76.1 | 15½ | — | — | 36 | 36.25 |
| 0.962 | 24.43 | 3.02 | 76.8 | 15¾ | — | — | — | 36.75 |
| 0.97 | 24.64 | 3.05 | 77.4 | 16 | — | — | 37 | 37.5 |