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International Ring Size Conversion Chart

>
US Size
Diameter in Inches
Diameter in MM
Metric -MM
British
French
German
Japanese
Swiss
0000
.390
9.91
 
-
       
00
.422
10.72
 
-
       
0
.454
11.53
 
-
       
1/2
.474
11.95
 
A
       
3/4
.482
12.18
 
A 1/2
       
1
.487
12.37
38.9
B
   
1
 
1 1/4
-
12.60
39.6
B 1/2
       
1 1/2
.503
12.78
40.2
C
       
1 3/4
-
13.00
40.8
C 1/2
       
2
.520
13.21
41.5
D
41 1/2
13 1/2
2
1 1/2
2 1/4
-
13.41
42.1
D 1/2
-
-
   
2 1/2
.536
13.61
42.7
E
42 3/4
13 3/4
3
2 3/4
2 3/4
-
13.83
43.4
E 1/2
-
-
   
3
.553
14.05
44.0
F
44
14
4
4
3 1/8
-
14.15
44.3
F 1/2
-
-
   
3 1/4
-
14.25
44.6
-
-
-
   
3 3/8
-
14.36
44.9
G
45 1/4
-
5
5 1/4
3 1/2
.569
14.45
45.2
-
-
14 1/2
   
3 5/8
-
14.56
45.6
 G 1/2
-
 
6
 
3 3/4
-
14.65
45.9
H
46 1/2
   
6 1/2
4
.585
14.86
46.5
H 1/2
-
15
7
 
4 1/4
-
15.04
47.1
47 3/4
   
7 3/4
4 1/2
.601
15.27
47.8
I 1/2
-
15 1/4
8
 
4 5/8
-
15.40
48.1
J
49
15 1/2
 
9
4 3/4
-
15.53
48.4
-
-
     
5
.618
15.70
49.0
J 1/2
-
15 3/4
9
 
5 1/8
-
15.80
49.3
K
50
   
10
5 1/4
-
15.90
49.6
-
-
     
5 3/8
-
16.0
50.0
K 1/2
-
 
10
 
5 1/2
.634
16.10
50.3
L
51 3/4
16
 
11 3/4
5 3/4
-
16.30
50.9
-
-
     
5 7/8
-
16.41
51.3
L 1/2
-
     
6
.650
16.51
51.5
M
52 3/4
16 1/2
12
12 3/4
6 1/4
-
16.71
52.2
M 1/2
-
     
6 1/2
.666
16.92
52.8
N
54
17
13
14
6 3/4
-
17.13
53.4
N 1/2
-
     
7
.683
17.35
54.0
O
55 1/4
17 1/4
14
15 1/4
7 1/4
-
17.45
54.7
O 1/2
-
     
7 1/2
.699
17.75
55.3
P
56 1/2
17 3/4
15
16 1/2
7 3/4
-
17.97
55.9
P 1/2
-
     
8
.716
18.19
56.6
Q
57 3/4
18
16
17 3/4
8 1/4
-
18.35
57.2
Q 1/2
-
     
8 1/2
.732
18.53
57.8
-
-
18 1/2
17
 
8 5/8
-
18.61
58.4
R
59
   
19
8 3/4
-
18.69
58.4
-
-
     
8 7/8
-
18.80
59.0
R 1/2
-
     
9
.748
18.89
59.1
-
-
19
18
 
9 1/8
-
19.10
59.4
S
60 1/4
   
20 1/4
9 1/4
-
19.22
59.7
-
-
     
9 3/8
-
19.31
60.0
S 1/2
-
     
9 1/2
.764
19.41
60.3
-
-
19 1/2
19
 
9 5/8
-
19.51
60.6
T
61 1/2
   
21 1/2
9 3/4
-
19.62
60.9
-
-
     
10
.781
19.84
61.6
T 1/2
-
20
20
 
10 1/4
-
20.02
62.2
U
62 3/4
 
21
22 3/4
10 1/2
.797
20.20
62.8
U 1/2
-
20 1/4
22
 
10 5/8
-
20.32
63.1
V
63
   
23 3/4
10 3/4
-
20.44
63.5
-
-
     
11
.814
20.68
64.1
V 1/2
-
20 3/4
23
 
11 1/8
-
20.76
64.3
W
65
   
25
11 1/4
-
20.85
64.7
-
-
     
11 3/8
-
20.94
65.0
W 1/2
-
     
11 1/2
-
21.08
65.3
-
-
21
24
 
11 5/8
.830
21.18
65.7
X
66 1/4
   
26 1/4
11 3/4
-
21.24
66.0
-
-
     
11 7/8
-
21.30
66.3
X 1/2
-
     
12
.846
21.49
66.6
Y
67 1/2
21 1/4
25
27 1/2
12 1/4
-
21.69
67.2
Y 1/2
-
     
12 1/2
.862
21.89
67.9
Z
68 3/4
21 3/4
26
28 3/4
12 3/4
-
22.10
68.5
Z 1/2
-
     
13
.879
22.33
69.1
-
-
22
27
 
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They deserve 10 stars not 5.

If you are thinking of buying a ring from here, DO IT! The set was far more beautiful then I could have imagined! The diamonds shine and are brilliantly beautiful and the main stone, breathtaking. The pictures don’t do it it justice at ALL!! The details are magnificent! My only regret is that this ring is for my fiancé and I ordered from a different company who wasn’t anywhere near as amazing as this one. Every detail including the engravings just PERFECT! They deserve 10 stars not 5.
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Read what customers have to say about their MDC Diamonds shopping experience.
 
They deserve 10 stars not 5.
If you are thinking of buying a ring from here, DO IT! The set was far more beautiful then I could h...
 
Hannah P
MONTGOMERY, AL
September 16, 2020

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Customer Service Address: 580 Fifth Avenue Suite 349, New York, NY 10036
Corporate Address: Manhattan, New York, NY
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