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Ring Size Guide

All Antique & Period jewellery and Modern jewellery pieces available at our antique and bespoke jewellery shop in Central London are sized in the British alphabetical sizing. Might you need to see jewellery in the European or American sizes, please refer to the chart below.

UK size US size Inside diameter (mm) Inside circumference (mm)
A ½ 12.04 37.8
B 1 12.45 39.1
C 1½ 12.85 40.4
D 2 13.26 41.7
E 2½ 13.67 42.9
F 3 14.07 44.2
G 3½ 14.48 45.5
H 4 14.88 46.8
I 4½ 15.29 48
J 4¾ 15.49 48.7
K 5¼ 15.9 50
L 5¾ 16.31 51.2
M 6¼ 16.71 52.5
N 6¾ 17.12 53.8
O 7¼ 17.53 55.1
P 7¾ 17.93 56.3
Q 8¼ 18.34 57.6
R 8¾ 18.75 58.9
S 9¼ 19.15 60.2
T 9¾ 19.56 61.4
U 10¼ 19.96 62.7
V 10¾ 20.37 64
W 11¼ 20.78 65.3
X 11¾ 21.18 66.6
Y 12¾ 21.59 67.8
Z 12½ 21.79 68.5

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