Diamond Ring Size Guide

Whether you are looking for a ring for yourself, gifting a loved one as a surprise or presenting it with a proposal, we’ve created this simple ring-sizer guide to help you find the perfect fit at home.

Diameter Circumference
  • UnIted States & Canada
  • Europe
  • United Kingdom & Australia
  • Singapore & Japan
  • Hong Kong
  • Switzerland
  • India
 US & CN EU UK & AUS SG & JAP HK CH Ind
14.1 mm 44.3 mm 3 44 F 1/2 4 6 4 4
14.3 mm 44.9 mm - 45 G 5 - 5 1/4 4
14.5 mm 45.6 mm 3.5 - G 1/2 - 7 - 4
14.7 mm 46.2 mm - 46 H 6 - 6 1/2 4
14.9 mm 46.8 mm 4 47 H 1/2 7 8 - 4
15.1 mm 47.4 mm - - I - - 7 3/4 4
15.3 mm 48.1 mm 4.5 48 I 1/2 8 9 - 4
15.5 mm 48.7 mm - - J - 10 - 4
15.7 mm 49.3 mm 5 49 J 1/2 9 - - 4
15.9 mm 50.0 mm - 50 K - 11 10 4
16.1 mm 50.6 mm 5.5 - K 1/2 10 - - 4
16.3 mm 51.2 mm - 51 L - 12 11 3/4 4
16.5 mm 51.8 mm 6 52 L 1/2 11 13 12 3/4 4
16.7 mm 52.5 mm - - M 12 - - 4
16.9 mm 53.1 mm 6.5 53 M 1/2 13 14 14 4
17.1 mm 53.7 mm - - N - - - 4
17.3 mm 54.3 mm 7 54 N 1/2 14 15 15 1/4 4
17.5 mm 55.0 mm - 55 O - 16 - 4
17.7 mm 55.6 mm 7.5 - O 1/2 15 - 16 1/2 4
17.9 mm 56.2 mm - 56 P - 17 - 4
18.1 mm 56.9 mm 8 57 P 1/2 15 - 17 3/4 4
18.2 mm 57.2 mm - - - - 18 - 4
18.3 mm 57.5 mm - - Q - - - 4
18.5 mm 58.1 mm 8.5 58 Q 1/2 17 - - 4
18.8 mm 59.1 mm - 59 R - 19 - 4
19.0 mm 59.7 mm 9 - R 1/2 18 20 - 4
19.2 mm 60.3 mm - 60 S - - 20 1/4 4
19.4 mm 60.9 mm 9.5 61 S 1/2 19 21 - 4
19.6 mm 61.6 mm - - T - - 21 1/2 4
19.8 mm 62.2 mm 10 62 T 1/2 20 22 - 4
20.0 mm 62.8 mm - - U 21 - - 4
20.2 mm 63.5 mm 10.5 63 U 1/2 22 23 22 3/4 4
20.4 mm 64.1 mm - 64 V - 24 - 4
20.6 mm 64.7 mm 11 - V 1/2 23 - - 4
20.8 mm 65.3 mm - 65 W - 25 25 4
21.0 mm 66.0 mm 11.5 66 W 1/2 24 - - 4
21.2 mm 66.6 mm - - X - 26 - 4
21.4 mm 67.2 mm 12 67 X 1/2 25 27 27 1/2 4
21.6 mm 67.9 mm - - Y - - - 4
21.8 mm 68.5 mm 12.5 68 Z 26 - 28 3/4 4
22.0 mm 69.1 mm - 69 Z 1/2 - - - 4
22.2 mm 69.7 mm 13 70 - 27 - - 4
22.4 mm 70.4 mm - - Z+1 - - - 4
22.6 mm 71.0 mm 13.5 - Z+2 - - - 4
22.9 mm - - - - - - - -
23.2 mm - - - - - - - -
23.5 mm - - - - - - - -
23.9 mm - - - - - - - -
24.2 mm - - - - - - - -