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Ring Size Guide
Use this chart for ring variants explicitly labelled US (for example, No6 US means US size 6). Measurements are approximate. If a product includes its own sizing chart, use that chart first.
How to measure
- Choose a ring that fits the intended finger comfortably.
- Measure the inside diameter in millimetres, straight across the centre, excluding the metal band.
- Compare your measurement with the chart. For a more accurate fit, ask a jeweller to measure your finger.
You can also wrap a narrow strip of paper around your finger, mark the overlap and measure the length in millimetres. It should fit snugly and pass over your knuckle. Measure again later in the day; cold fingers can give a smaller measurement.
| US size | Inside diameter (mm) | Inside circumference (mm) |
|---|---|---|
| 3 | 14.1 | 44.2 |
| 3.5 | 14.5 | 45.5 |
| 4 | 14.9 | 46.8 |
| 4.5 | 15.3 | 48 |
| 5 | 15.7 | 49.3 |
| 5.5 | 16.1 | 50.6 |
| 6 | 16.5 | 51.9 |
| 6.5 | 16.9 | 53.1 |
| 7 | 17.3 | 54.4 |
| 7.5 | 17.7 | 55.7 |
| 8 | 18.1 | 57 |
| 8.5 | 18.5 | 58.3 |
| 9 | 18.9 | 59.5 |
| 9.5 | 19.4 | 60.8 |
| 10 | 19.8 | 62.1 |
For adjustable or open rings, check the product description for the stated adjustment range. This chart does not guarantee that every listed size is available.







