Use a ring that fits
Choose a ring worn comfortably on the same finger and hand. Measure the inside diameter straight across its centre, edge to edge. Do not include the metal band.
The ring size guide
A little detail.
A perfect beginning.
Find a comfortable fit for a ring you’ll wear every day. Start with a ring you love, a simple measurement, or a fitting with our team.
At-home measurements are a starting point. A professional fitting is the best way to confirm your size.
Inside diameter
MEASURE THE INSIDE. IN MILLIMETRES.
Illustration only · Not to scale01 / Start with the fit
Three ways to find your size.
Measure the finger that will wear the ring. Your left and right hands may fit differently, and a wider band can feel snugger than a slim one.
Measure your finger
Wrap a narrow paper strip around the base of your finger, mark where it meets, then measure that length in millimetres. Check that it can pass over your knuckle. Repeat to check consistency.
Confirm with a fitting
Ask our team to check your size with a ring sizer. Try a width similar to your chosen design, especially if you are considering a wider band or a stack of rings.
A comfortable fit: your ring should feel secure at the base of your finger and pass over the knuckle with a little resistance. Measure when your hands are at a normal temperature; heat, cold and temporary swelling can affect the result.
02 / Translate your measurement
One measurement.
A clearer starting point.
Match your measurement to the reference chart in our eight-page ring size guide. International conversions are approximate and can vary between jewellers.
Start with your measurement in millimetres. For the most comfortable fit, confirm your size with our team before choosing your ring.
| Diameter | HK | US ≈ | UK ≈ |
|---|---|---|---|
| 14.1 mm | 6 | 3 | F |
| 14.3 mm | 7 | 3¼ | F½ |
| 14.7 mm | 8 | 3¾ | G |
| 14.9 mm | 9 | 4 | H |
| 15.3 mm | 10 | 4½ | I |
| 15.7 mm | 11 | 5 | J½ |
| 16.1 mm | 12 | 5½ | K½ |
| 16.5 mm | 13 | 6 | L½ |
| 16.7 mm | 14 | 6¼ | M |
| 17.1 mm | 15 | 6¾ | N |
| 17.3 mm | 16 | 7 | N½ |
| 17.7 mm | 17 | 7½ | O½ |
| 18.2 mm | 18 | 8 | P½ |
| 18.5 mm | 19 | 8½ | Q½ |
| 18.8 mm | 20 | 9 | R½ |
| 19.1 mm | 21 | 9¼ | S |
| 19.4 mm | 22 | 9½ | S½ |
| 19.8 mm | 23 | 10 | T½ |
| 20.2 mm | 24 | 10½ | U½ |
| 20.6 mm | 25 | 11 | V½ |
| 21.0 mm | 26 | 11½ | W½ |
| 21.2 mm | 27 | 12 | X |
| 21.6 mm | 28 | 12¼ | Y |
Reference: page 4 of our downloadable guide. At-home measurements and conversions are approximate.
Find your chart match
Enter a measurement in millimetres. This is an estimate, not a guaranteed fit.
Planning a surprise?
No ring to measure?
Start with a rough estimate.
If you don’t have access to a ring or a finger measurement, the broad ranges in our guide can give you a starting point for a conversation with our team.
A guess, not a measured size. These informal adult ranges are not based on validated client measurements. Two people with the same height and weight can have very different finger sizes. Don’t commission a ring from this result alone.
Source: page 5 of the Diamond Ateliers guide. Overlapping rows are combined; we never choose a single “best” size.
A starting range for the surprise
Only choose a shape if you already know it. Height and weight don’t tell us hand shape.
Your broad starting range will appear here.
Calculated on this page only. Your entries aren’t saved or sent anywhere.
A better way to keep the surprise: ask a trusted friend discreetly, plan a fitting after the proposal, or discuss a temporary proposal ring with our team. Confirm the final size before making the ring; resizing depends on the design.
03 / A guide to keep
A little more confidence,
wherever you are.
Keep the ring-sizing guidance close at hand, or share it with someone helping you plan the surprise.
Download the free 8-page guidePDF · 8 pages · Print at 100% on A4 and check the 50 mm verification bar.
DIAMOND ATELIERSThe Ring
Size GuideA THOUGHTFUL START TO THE PERFECT FIT
Size GuideA THOUGHTFUL START TO THE PERFECT FIT
04 / Keep the surprise
A few questions, answered.
How can I find their ring size without asking?
If possible, borrow a ring they already wear on the intended finger and hand, or ask someone close to them for help. A ring worn on a different finger is only a rough clue. Our team can help you decide the next step without relying on a guess.
Can I work out ring size from height or weight?
Height and weight cannot reliably tell you someone’s ring size. If you have no ring or measurement, our rough estimator shows the broad, unvalidated starting ranges from our guide. Treat the result as a conversation starter, not an order size. A fitting or a suitable existing ring gives a better basis.
What if the measurement falls between two sizes?
Repeat the measurement and consider the width of your chosen ring. There isn’t one rule that suits every finger or design. Ask our team to help confirm the most comfortable fit before placing an order.
Can an engagement ring be resized after the proposal?
It depends on the ring’s design, metal, setting and the amount of adjustment needed. Some designs may have restrictions. Ask us to confirm the options, timing and any cost for the specific ring before ordering.
Are Hong Kong, US and UK ring sizes interchangeable?
No. They use different labels, and conversion charts can vary. Give us the inside diameter or circumference in millimetres as well as any size label you have, so we can confirm the correct fit for your chosen ring.
How should I use a printable ring-size guide?
Follow the printing and calibration instructions in the final PDF. Print at actual size rather than “fit to page”, then check its scale marker with a ruler before measuring. A screen or an incorrectly scaled printout cannot be used as a reliable sizing tool.
Made personal
Let’s find your fit together.
A fitting is a simple place to begin. Talk through your size, your preferred ring style and the details of your proposal with our team.
Book a ring-sizing appointmentChoose an available time through our appointment booking page.