Pearl Constellation Ring
£88.27
Blue Moissanite Butterfly Ring
£216.18
Rainbow Moissanite Statement Ring
£246.10
Azure Dreams Band Ring
£95.75
Rings from our collection — several are adjustable, one size fits most
Buying a ring online is easy — until the size question. The good news: you can measure accurately at home with things you already own. Here are the three most reliable methods, plus the mistakes that cause most sizing errors.
Method 1: Measure a ring you already own
The most accurate home method. Take a ring that fits the intended finger well, and measure its inside diameter in millimetres with a ruler — measure straight across the middle, inner edge to inner edge. Then match it in the chart below. This is also the best trick for gifts: borrow a ring your partner wears on that finger (briefly!) and measure it.
Method 2: The string or paper strip
Cut a thin strip of paper, wrap it snugly around the base of the finger, mark where it overlaps, and measure the length in millimetres — that's your finger circumference. Wrap firmly but not tight: the strip should slide over the knuckle with slight resistance. Do it two or three times and take the average, as small variations are normal.
Method 3: A printable or physical ring sizer
Free printable sizers work if you print at 100% scale (check the calibration line against a ruler). Cheap plastic sizer sets from the high street or online are even better and take the guesswork out entirely — worth it if you're planning an important purchase.
Conversion chart
| Inside diameter (mm) | Circumference (mm) | UK | US | EU |
|---|---|---|---|---|
| 15.7 | 49.3 | J½ | 5 | 49 |
| 16.5 | 51.9 | L½ | 6 | 52 |
| 17.3 | 54.4 | N½ | 7 | 54 |
| 18.1 | 57.0 | P½ | 8 | 57 |
| 19.0 | 59.5 | R½ | 9 | 59 |
| 19.8 | 62.1 | T½ | 10 | 62 |
Mistakes that ruin the measurement
Fingers change size through the day and with temperature — they're smallest when cold and largest in the evening or in heat, sometimes by half a size. So measure at the end of the day, at normal room temperature. Account for your knuckle: if it's noticeably wider than the base of your finger, size for something between the two. And for wide bands, go up half a size — they fit more snugly than thin ones.
Or skip the problem entirely
Several of our rings — including the Pearl Constellation, the Blue Moissanite Butterfly and the Rainbow Moissanite Statement Ring — are adjustable, designed to fit a range of sizes with a gentle squeeze. If you're buying a surprise gift and can't measure, an adjustable ring removes the risk completely.