Ring Size Guide

Lumière Jewellers

Ring Size Guide

Finding the perfect fit is just as important as finding the perfect ring. Use this guide to measure accurately — or simply let us know if you need help and we will guide you through it personally.

How to measure

Three ways to find your size

We recommend measuring at the end of the day when fingers are at their largest, and avoid measuring when hands are cold. If you are between sizes, always size up.

01
Use a ring you own

Place an existing ring that fits well on a ruler and measure the internal diameter in millimetres. Use the table below to find your size.

02
String or paper method

Wrap a thin strip of paper or string around the base of your finger. Mark where it overlaps, lay it flat and measure the length in mm. This is your circumference.

03
Ask us for help

Not sure? Simply note it in your consultation and we will guide you to the right size. We can also build in a complimentary resize allowance.

Important tip

Fingers change size throughout the day — they are smallest in the morning and largest in the evening. We recommend measuring in the evening for the most accurate result. If you are buying as a surprise, ring size 6 (US) is the most common size for women and size 10 (US) for men.

Conversion chart

International size conversion

Find your size across all international systems. If you are unsure which system your country uses, simply include your finger circumference in mm in your consultation form and we will do the rest.

Diameter (mm) Circumference (mm) USA / Canada UK / Ireland / Australia / NZ India / China / Japan / South America Italy / Spain / Netherlands
14.48 45.5 3½ G — 5.5
14.68 46.1 3¾ G½ 6 6
14.88 46.8 4 H 7 6.75
15.09 47.4 4¼ H½ — 7.5
15.29 48 4½ I — 8
15.49 48.7 4¾ J — 8.75
15.7 49.3 5 J½ 9 9.25
15.9 50 5¼ K — 10
16.1 50.6 5½ K½ 10 10.5
16.31 51.2 5¾ L — 11.25
16.51 51.9 6 L½ 11 11.75
16.71 52.5 6¼ M 12 12.5
16.92 53.1 6½ M½ 13 13.25
17.12 53.8 6¾ N — 13.75
17.32 54.4 7 N½ 14 14.5
17.53 55.1 7¼ O — 15
17.73 55.7 7½ O½ 15 15.75
17.93 56.3 7¾ P — 16.25
18.14 57 8 P½ 16 17
18.34 57.6 8¼ Q — 17.5
18.54 58.3 8½ Q½ 17 18.25
18.75 58.9 8¾ R — 19
18.95 59.5 9 R½ 18 19.5
19.15 60.2 9¼ S — 20.25
19.35 60.8 9½ S½ 19 20.75
19.56 61.4 9¾ T — 21.5
19.76 62.1 10 T½ 20 22
19.69 62.7 10¼ U 21 22.75
20.17 63.4 10½ U½ 22 23.25
20.37 64 10¾ V — 24
20.57 64.6 11 V½ 23 24.75
20.78 65.3 11¼ W — 25.25
20.98 65.9 11½ W½ 24 26
21.18 66.6 11¾ X — 26.5
21.39 67.2 12 X½ 25 27.25
21.59 67.8 12¼ Y — 27.75
21.79 68.5 12½ Z 26 28.5
22 69.1 12¾ Z½ — 29
22.2 69.7 13 — 27 29.75
22.4 70.4 13¼ Z1 — 30.5
22.61 71 13½ — — 31
22.81 71.7 13¾ Z2 — 31.75
23.01 72.3 14 Z3 — 32.25
23.22 72.9 14¼ — — 33
23.42 73.6 14½ Z4 — 33.5
Not sure? Don't worry

If you are purchasing as a surprise proposal gift, don't stress about getting the size exactly right. We offer a complimentary first resize on all rings. Simply note "sizing help needed" in your consultation form and we will take it from there.

Ready to begin?

Submit your consultation and include your ring size — or let us know if you need help and we will guide you through it.

Begin your consultation