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International Ring Size Conversion Chart

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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
I 
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
  
Education and Guidance
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On Monday, August 2, 2010, I visited the MDC Diamonds staff at their office in the popular NYC's diamond district. The staff, especially Rosa, was extremely knowledgeable, friendly and down to earth. They had a no pressure approach and advised me in choosing my asscher cut diamond earrings, which I receive complements on almost daily. Rosa took the time to show me the differences between two types of asscher cuts and provided me with the option to choose each stone to be set, which were ready the next day. Thank you very much to all the staff at MDC Diamonds for your knowledge, prompt service and friendliness. It was a pleasure.
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Phenomenal Service and Quality at an Affordable Price
On Monday, August 2, 2010, I visited the MDC Diamonds staff at their office in the popular NYC's dia...
 
Christina S.
Toronto, Canada
August 18, 2010

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