Ring Size Guide
Every ring we make is crafted to order in your exact size, so it is worth taking a minute to get this right. Because made-to-order pieces cannot be returned, an accurate size saves you a resize later.
Ring size chart
Find your size below. Inside diameter is measured straight across the inside of the band; inside circumference is the distance all the way around it.
| US / Canada | Inside diameter (mm) | Inside circumference (mm) | UK / Australia |
|---|---|---|---|
| 3 | 14.0 | 44.2 | F |
| 3½ | 14.4 | 45.5 | G |
| 4 | 14.8 | 46.8 | H |
| 4½ | 15.2 | 48.0 | I |
| 5 | 15.7 | 49.3 | J½ |
| 5½ | 16.1 | 50.6 | K½ |
| 6 | 16.5 | 51.9 | L½ |
| 6½ | 16.9 | 53.1 | M½ |
| 7 | 17.3 | 54.4 | N½ |
| 7½ | 17.7 | 55.7 | O½ |
| 8 | 18.1 | 57.0 | P½ |
| 8½ | 18.5 | 58.3 | Q½ |
| 9 | 19.0 | 59.5 | R½ |
| 9½ | 19.4 | 60.8 | S½ |
| 10 | 19.8 | 62.1 | T½ |
| 10½ | 20.2 | 63.4 | U½ |
| 11 | 20.6 | 64.6 | V½ |
| 11½ | 21.0 | 65.9 | W½ |
| 12 | 21.4 | 67.2 | X½ |
| 12½ | 21.8 | 68.5 | Y |
| 13 | 22.2 | 69.7 | Z |
How to measure at home
You need a strip of paper about 10 cm long and 1 cm wide, or a piece of non-stretchy string, plus a ruler with millimetres.
- Wrap the strip around the base of the finger the ring will sit on.
- Pull it snug — firm enough that it will not slide off, loose enough to still turn.
- Mark where the end overlaps, then lay the strip flat and measure to your mark in millimetres.
- That measurement is your inside circumference. Match it to the chart above.
If your measurement falls between two sizes, choose the larger one. A ring that is slightly loose can be worn; one that is too tight cannot.
Getting it right
- Measure at the end of the day. Fingers are at their largest in the evening and in warm weather, and smallest first thing in the morning or when you are cold.
- Measure the correct hand. Your dominant hand is usually half a size larger.
- Allow for wide bands. Anything above roughly 6 mm wide sits tighter, so go up a half size.
- Mind the knuckle. If your knuckle is noticeably wider than the base of your finger, size so the ring passes the knuckle comfortably.
- Do not measure a cold finger. Wait until your hands are at normal temperature.
- Borrow a ring with care. Measuring an existing ring only works if it fits the same finger on the same hand.
Where to enter your size
Choose your size in the Ring Size field on the product page before adding the piece to your cart. Please enter a US size from the chart above so there is no ambiguity.
Still not sure?
Tell us the finger, the hand and the style you are looking at, and we will help you settle on a size before you order. Email growndiamondjewelry@gmail.com or call +1 (564) 224 7807. It is far easier to get this right up front than to resize a finished ring.