Size
(mm)
Amen Ring
Size
Diameter
(mm)
Japan,
China
USA
(mm)
UK
(mm)
Italy
48
8
15.27
8
8
49
15.7
9
5
9.5
51
10
16.1
11
L
10.5
52
12
16.51
12
6
M
11.5
53
16.92
13
N
13
55
14
17.35
14
7
O
14.5
56
16
17.75
15
P
16
57
18.19
16
8
Q
17
58
18
18.53
17
18.5
59
18.89
18
9
19.5
61
20
19.41
19
21
62
22
19.84
20
10
22
63
20.2
22
10½
23.5
65
24
20.68
23
11
25
66
26
21.08
24
11½
26.5
68
28
21.49
25
12
Y
27.5
69
21.89
26
12½
Z
28.5
70
30
22.33
27
13
30