Sizing & FAQ
Buy the right size the first time.
A ring that fits is the whole point. Measure once, then use the table below — and if you fall between two rows, size up.
US size to inner diameter
Both the inner diameter and the finger circumference are given in millimetres, so the table works outside the US. If you measure between two sizes, choose the larger one.
| US size | HK size | Inner diameter | Finger circumference |
|---|---|---|---|
| 5 | 10–11 | 15.8 mm | 51 mm |
| 6 | 12–13 | 16.6 mm | 53 mm |
| 7 | 14–15 | 17.4 mm | 55 mm |
| 8 | 16–18 | 18.3 mm | 58 mm |
| 9 | 19–20 | 19.1 mm | 60 mm |
| 10 | 21–22 | 20.0 mm | 62 mm |
| 11 | 23–24 | 21.0 mm | 65 mm |
| 12 | 25–27 | 22.0 mm | 68 mm |
Measurements are the manufacturer's published specifications for the rings we stock. If your measurement sits between two sizes, or you are unsure, email us at hello@cktjewelry.com before ordering — a ring that fits the first time is worth the extra minute.
Measuring at home
Four steps, one piece of string.
- 1Wrap a strip of paper or a piece of non-stretchy string around the base of the finger.
- 2Mark where the end meets, then lay it flat and measure the length in millimetres — that is the circumference.
- 3Match the circumference against the table. If you fall between two rows, choose the larger size.
- 4Measure at the end of the day, when fingers are at their largest, and check the piece clears the knuckle.
Sizing questions
Sizing, answered.
General questions
About the site and the pieces.
Still unsure
Ask us before you order.
Tell us the piece and the size you think you need. We will confirm whether it can be made before anything is ordered.