Ring Size Guide (AU / UK)
Choosing the correct ring size is essential to ensure comfort, security, and the perfect fit.
At JLIM Diamonds, we use the Australian / UK ring sizing system,
which is standard across New Zealand.
If you are unsure of your ring size, follow the guide below or contact us for personalised assistance
before placing your order.
How to Measure Your Ring Size
Option 1: Measure an Existing Ring
- Select a ring that fits the intended finger comfortably.
- Measure the inside diameter of the ring in millimetres.
- Match the measurement to the chart below.
Option 2: Measure Your Finger
- Wrap a thin strip of paper or string around the base of your finger.
- Mark where the paper or string overlaps.
- Measure the length in millimetres.
- Use the inside circumference column in the chart to find your size.
Tip: Measure your finger at room temperature, as fingers may swell in warm conditions.
Ring Size Chart (AU / UK)
| AU / UK Size | Inside Diameter (mm) | Inside Circumference (mm) |
|---|---|---|
| E | 15.3 | 48.0 |
| E 1/2 | 15.5 | 48.7 |
| F | 15.7 | 49.3 |
| F 1/2 | 15.9 | 50.0 |
| G | 16.1 | 50.6 |
| G 1/2 | 16.3 | 51.2 |
| H | 16.5 | 51.9 |
| H 1/2 | 16.7 | 52.5 |
| I | 16.9 | 53.1 |
| I 1/2 | 17.1 | 53.8 |
| J | 17.3 | 54.4 |
| J 1/2 | 17.5 | 55.1 |
| K | 17.7 | 55.7 |
| K 1/2 | 17.9 | 56.3 |
| L | 18.1 | 57.0 |
| L 1/2 | 18.3 | 57.6 |
| M | 18.5 | 58.3 |
| M 1/2 | 18.7 | 58.9 |
| N | 19.0 | 59.5 |
| N 1/2 | 19.2 | 60.2 |
| O | 19.4 | 60.8 |
| O 1/2 | 19.6 | 61.4 |
| P | 19.8 | 62.1 |
| P 1/2 | 20.0 | 62.7 |
| Q | 20.2 | 63.4 |
| Q 1/2 | 20.4 | 64.0 |
| R | 20.6 | 64.6 |
| R 1/2 | 20.8 | 65.3 |
| S | 21.0 | 65.9 |
| S 1/2 | 21.2 | 66.6 |
| T | 21.4 | 67.2 |
| T 1/2 | 21.6 | 67.8 |
| U | 21.8 | 68.5 |
| U 1/2 | 22.0 | 69.1 |
| V | 22.2 | 69.7 |
| V 1/2 | 22.4 | 70.4 |
| W | 22.6 | 71.0 |
| W 1/2 | 22.8 | 71.6 |
| X | 23.0 | 72.3 |
| X 1/2 | 23.2 | 72.9 |
| Y | 23.4 | 73.6 |
| Y 1/2 | 23.6 | 74.2 |
| Z | 23.8 | 74.8 |
| Z 1/2 | 24.0 | 75.5 |
| Z +1 | 24.4 | 76.8 |
| Z +2 | 24.8 | 78.0 |
Important Ring Sizing Notes
- Wider bands may feel tighter — consider sizing up by half a size.
- Your dominant hand is often slightly larger.
- Custom-made rings may have limited resizing options.
- Engagement and eternity rings should fit securely without discomfort.
Still unsure? Contact JLIM Diamonds for expert guidance before placing your order.