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Size Guide

Circumference (mm)
Interior Diameter (mm)
USA / Canada
UK / Australia
40
12.7
1,4(1)
C
41
13.0
1,8(1-)
C 1/2
42
13.4
2,2(2)
D 1/2
43
13.7
2,6(2-)
E 1/2
44
14.0
3,0(2-)
F
45
14.3
3,4(3)
 G
46
14.6
3,7(3-)
G 1/2
47
15.0
4,1(4)
H 1/2
48
15.3
4,5(4-)
 11/2
49
15.6
4,9(4-)
50
15.9
5,3(5)
K
51
16.2
5,7(5-)
K 1/2
52
16.6
6,1(6)
L1/2
53
16.9
6,4(6)
M 1/2
54
17.2
6,8(6-)
N
55
17.5
7,2(7)
O
56
17.8
7,6(7-)
P
57
18.1
8,0(7-)
P 1/2
58
18.5
8,4(8)
Q 1/2
59
18.8
8,7(8-)
R
60
19.1
9,1(9)
S
61
19.4
9,5(9-)
T
62
19.7
9,9(9-)
T 1/2
63
20.1
10,3(10)
U 1/2
64
20.4
10,7(10-)
V
65
20.7
11,0(11)
W
66
21.0
11,4(11)
X
67
21.3
11,8(11-)
X1/2
68
19.8
12,2(12)
Y 1/2
69
20.0
12,6(12-)
Z 1/2
70
20.2
13,0(12-)
Z +1

 

Here are a few tips for determining the ring size: we recommend that you take measurements for a ring of the same or similar shank width. For very thin rings you usually need about half to one size less than with broader rings.
 
When determining the ring size, please measure a ring and not something flexible (like a thread, the finger or tape), as this can lead to big inaccuracies.
 
Determining the ring size from the inner diameter of a ring can be somewhat inaccurate, since a difference of 1 mm can make a difference of about 3 ring sizes (see table below).
 
Therefore, we recommend either to measure very accurately with a caliper gauge (including tenths of a mm.) or to have the matching ring measured in a goldsmith's store - or send it to us. 
 
If you do not have a fitting ring, it is best to have the ring size measured in a goldsmith store, all other methods are unfortunately imprecise.
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