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https://www.claudiabradby.com/ring-size-guide

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Ring Size Guide

Inside Diameter (inches)
Inside Diameter (mm)
Inside Circumference (inches)
Inside Circumference (mm)
Ring Size UK
Ring Size USA
Ring Size Europe
0.59
15.2
1.86
47.4
I
47½
0.60
15.4
1.89
48.0
48
0.61
15.6
1.92
48.7
J
48½
0.62
15.8
1.94
49.3
5
49
0.63
16.0
1.97
50.0
K
50
0.63
16.1
1.99
50.6
50½
0.64
16.4
2.02
51.2
L
51
0.65
16.6
2.04
51.9
6
52
0.66
16.8
2.07
52.5
M
52½
0.67
17.0
2.09
53.1
53
0.67
17.2
2.12
53.8
N
53½
0.68
17.4
2.14
54.4
7
54
0.69
17.6
2.17
55.1
O
55
0.70
17.8
2.19
55.7
55½
0.71
18.0
2.22
56.3
P
56
0.71
18.2
2.24
57.0
8
57
0.72
18.4
2.27
57.6
Q
57½
0.73
18.6
2.29
58.3
58
0.74
18.8
2.32
58.9
R
59

The National Association of Jewellers Approved Supplied to the Company of Master Jewellers