Ring Sizing Guide

Ruth makes rings following British sizing guides. Use the chart as a guide to help you work out your ring size. The chart will help you find the closest equivalent size to your country sizing scale. Please see information about ordering your correct ring size in the FAQ section.

British Size Inside Diameter mm USA Size Inside Diameter mm European Size Inside Diameter mm Japan Size Inside Diameter mm
 
 
 
 
 
 
 
 
A
11.97
0.5
11.97
 
 
 
 
B
12.36
1
12.37
1
13.04
1
13.00
C
12.75
1.5
12.78
2
13.36
2
13.33
D
13.14
2
13.21
3
13.67
3
13.66
E
13.53
2.5
13.61
4
13.99
4
14.00
F
13.92
3
14.05
5
14.31
5
14.33
G
14.31
3.5
14.45
6
14.63
6
14.66
H
14.70
4
14.86
7
14.95
7
15.00
I
15.09
4.5
15.27
8
15.27
8
15.33
J
15.48
5
15.70
9
15.58
9
15.66
K
15.87
5.5
16.10
10
15.90
10
16.00
L
16.26
6
16.51
11
16.22
11
16.33
M
16.65
6.5
16.92
12
16.54
12
16.66
N
17.04
7
17.35
13
16.86
13
17.00
O
17.45
7.5
17.75
14
17.17
14
17.33
P
17.86
8
18.19
15
17.49
15
17.66
Q
18.27
8.5
18.59
16
17.81
16
18.00
R
18.68
9
18.89
17
18.13
17
18.33
S
19.09
9.5
19.41
18
18.45
18
18.66
T
19.50
10
19.84
19
18.76
19
19.00
U
19.91
10.5
20.20
20
19.08
20
19.33
V
20.32
11
20.24
21
19.40
21
19.66
W
20.73
11.5
20.68
22
19.72
22
20.00
X
21.14
12
21.08
23
20.04
23
20.33
Y
21.55
12.5
21.49
24
20.35
24
20.66
Z
21.96
13
21.89
25
20.67
25
21.00
 
 
13.5
22.33
26
20.99
26
21.33
 
 
 
 
27
21.31
27
21.66
 
 
 
 
28
21.63
 
 
 
 
 
 
29
21.94
 
 
 
 
 
 
30
22.26