Service
Ring Size
Guide
Finding the correct ring size ensures a comfortable fit and avoids the need for resizing. Use this guide to measure accurately at home.
International Chart
Ring Size Conversion
| US / Canada | UK / Australia | Europe | Diameter | Circumference |
|---|---|---|---|---|
| 4 | H | 47 | 14.9 mm | 46.8 mm |
| 4.5 | I | 48 | 15.3 mm | 48.0 mm |
| 5 | J | 49 | 15.7 mm | 49.3 mm |
| 5.5 | K | 50 | 16.1 mm | 50.6 mm |
| 6 | L | 51 | 16.5 mm | 51.9 mm |
| 6.5 | M | 53 | 16.9 mm | 53.1 mm |
| 7 | N | 54 | 17.3 mm | 54.4 mm |
| 7.5 | O | 55 | 17.7 mm | 55.7 mm |
| 8 | P | 57 | 18.1 mm | 57.0 mm |
| 8.5 | Q | 58 | 18.5 mm | 58.3 mm |
| 9 | R | 59 | 18.9 mm | 59.5 mm |
| 9.5 | S | 60 | 19.4 mm | 60.8 mm |
| 10 | T | 62 | 19.8 mm | 62.1 mm |
How To
Measuring at Home
You will need a thin strip of paper, a pen, and a ruler. Measure in the evening when fingers are at their largest, and avoid measuring when cold.
Use a strip of paper
Cut a thin strip of paper approximately 10 cm long and 0.5 cm wide.
Wrap around your finger
Wrap the paper snugly around the base of the finger you intend to wear the ring on. Mark where the paper overlaps.
Measure the length
Lay the paper flat and measure the length in millimetres from the end to your mark. This is your circumference.
Find your size
Match your circumference measurement to the chart above. If between sizes, we recommend choosing the larger size.
Important: Ring size can vary by up to half a size depending on temperature and time of day. We recommend measuring 2–3 times and taking the average. If you are between sizes, always choose the larger size.
For Proposals
Planning a
surprise?
Choosing a ring size without your partner knowing is one of the most common challenges in engagement ring shopping. Here are several discreet methods our advisors recommend.
Borrow an existing ring
Take a ring your partner wears on their ring finger and trace the inside diameter on paper, or bring it to our studio for measurement.
Ask a trusted friend or family member
A close friend or sibling may already know the size, or can help you find out discreetly.
Order a standard size
The average ring size for women is EU 53 (US 6.5) and for men EU 63 (US 10). DETARA offers complimentary resizing within 30 days of delivery.
Contact our advisors
Our diamond advisors have guided hundreds of proposals. We are happy to advise on the best approach for your situation.
Still unsure about your size?
Contact our advisors for personal guidance. We respond within 4 hours.