Ring Size Guide

Method 

Measure a ring you already love.

  • Choose a ring that fits the finger you plan to wear your new piece on.
  • Lay it flat on a ruler and measure straight across the inside, edge to edge, in millimetres.
  • Find that number in our size chart.

How to measure the inside diameter of a ring.

Good to know.

  • Measure twice. A millimetre either way can change your size.
  • Measure late in the day. Fingers are fullest in the afternoon when your hands are warm, and a little smaller in the morning or the cold. If you land between sizes, go up.
  • Measure the exact finger. Every finger is different, and so is each hand.

Can my ring be resized?

Fingers change over the years, and your ring can change with them. We don't offer resizing, but if your ring has a plain section of band, most local jewellers can adjust it when the time comes. 

Eternity bands are the exception. With diamonds all the way round, there's nowhere to adjust, so the size you choose is the size it stays. That's the trade for sparkle from every angle.

Even on rings that can be adjusted, big changes of more than two sizes can alter how a ring sits and looks.

Ring Size Conversion Chart

Sizes Inside diameter Inside circumference
Australia, NZ, UK & Ireland United States & Canada (mm) (in) (mm) (in)
A ½ 12.04 0.474 37.8 1.49
A½ ¾ 12.24 0.482 38.5 1.51
B 1 12.45 0.490 39.1 1.54
B½ 1¼ 12.65 0.498 39.7 1.56
C 1½ 12.85 0.506 40.4 1.59
C½ 1¾ 13.06 0.514 41.0 1.61
D 2 13.26 0.522 41.7 1.64
D½ 2¼ 13.46 0.530 42.3 1.67
E 2½ 13.67 0.538 42.9 1.69
E½ 2¾ 13.87 0.546 43.6 1.72
F 3 14.07 0.554 44.2 1.74
F½ 3¼ 14.27 0.562 44.8 1.77
G 3½ 14.48 0.570 45.5 1.79
G½ 3¾ 14.68 0.578 46.1 1.82
H 4 14.88 0.586 46.8 1.84
H½ 4¼ 15.09 0.594 47.4 1.87
I 4½ 15.29 0.602 48.0 1.89
J 4¾ 15.49 0.610 48.7 1.92
J½ 5 15.70 0.618 49.3 1.94
K 5¼ 15.90 0.626 50.0 1.97
K½ 5½ 16.10 0.634 50.6 1.99
L 5¾ 16.31 0.642 51.2 2.02
L½ 6 16.51 0.650 51.9 2.04
M 6¼ 16.71 0.658 52.5 2.07
M½ 6½ 16.92 0.666 53.1 2.09
N 6¾ 17.12 0.674 53.8 2.12
N½ 7 17.32 0.682 54.4 2.14
O 7¼ 17.53 0.690 55.1 2.17
O½ 7½ 17.73 0.698 55.7 2.19
P 7¾ 17.93 0.706 56.3 2.22
P½ 8 18.14 0.714 57.0 2.24
Q 8¼ 18.34 0.722 57.6 2.27
Q½ 8½ 18.54 0.730 58.3 2.29
R 8¾ 18.75 0.738 58.9 2.32
R½ 9 18.95 0.746 59.5 2.34
S 9¼ 19.15 0.754 60.2 2.37
S½ 9½ 19.35 0.762 60.8 2.39
T 9¾ 19.56 0.770 61.4 2.42
T½ 10 19.76 0.778 62.1 2.44
U 10¼ 19.96 0.786 62.7 2.47
U½ 10½ 20.17 0.794 63.4 2.49
V 10¾ 20.37 0.802 64.0 2.52
V½ 11 20.57 0.810 64.6 2.54
W 11¼ 20.78 0.818 65.3 2.57
W½ 11½ 20.98 0.826 65.9 2.59
X 11¾ 21.18 0.834 66.6 2.62
X½ 12 21.39 0.842 67.2 2.65
Y 12¼ 21.59 0.850 67.8 2.67
Z 12½ 21.79 0.858 68.5 2.70
Z½ 12¾ 22.00 0.866 69.1 2.72