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International ring size Conversion table

USA  & Canada Diameter
(inch)		 Diameter
(mm)		 Metric
(mm)		 British  French  German  Japan  Swiss 
0 0.39 9.91   -        
00 0.422 10.72   -        
000 0.454 11.53   -        
1/4 0.474 11.95   A        
3/4 0.482 12.18   A 1/2        
1 0.487 12.37 38.9 B     1  
1 1/4 - 12.6 39.6 B 1/2        
1 1/2 0.503 12.78 40.2 C        
1 3/4 - 13 40.8 C 1/2        
2 0.52 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 0.536 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 0.553 14.05 44 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 0.569 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 0.585 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 0.601 15.27 47.8 I 1/2 - 15 1/4 8  
4 5/8 - 15.4 48.1 J 49 15 1/2   9
4 3/4 - 15.53 48.4 - -      
5 0.618 15.7 49 J 1/2 - 15 3/4 9  
5 1/8 - 15.8 49.3 K 50     10
5 1/4 - 15.9 49.6 - -      
5 3/8 - 16 50 K 1/2 -   10  
5 1/2 0.634 16.1 50.3 L 51 3/4 16   11 3/4
5 3/4 - 16.3 50.9 - -      
5 7/8 - 16.41 51.3 L 1/2 -      
6 0.65 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 0.666 16.92 52.8 N 54 17 13 14
6 3/4 - 17.13 53.4 N 1/2 -      
7 0.683 17.35 54 O 55 1/4 17 1/4 14 15 1/4
7 1/4 - 17.45 54.7 O 1/2 -      
7 1/2 0.699 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 0.716 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 0.732 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 - 18.8 59 R 1/2 -      
9 0.748 18.89 59.1 - - 19 18  
9 1/8 - 19.1 59.4 S 60 1/4     20 1/4
9 1/4 - 19.22 59.7 - -      
9 3/8 - 19.31 60 S 1/2 -      
9 1/2 0.764 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 0.781 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 0.797 20.2 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 0.814 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 W 1/2 -      
11 1/2 - 21.08 65.3 - - 21 24  
11 5/8 0.83 21.18 65.7 X 66 1/4     26 1/4
11 3/4 - 21.24 66 - -      
11 7/8 - 21.3 66.3 X 1/2 -      
12 0.846 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 0.862 21.89 67.9 Z 68 3/4 21 3/4 26 28 3/4
12 3/4 - 22.1 68.5 Z 1/2 -      
13 0.879 22.33 69.1 - - 22 27  

Most common sizes for lady's is 17 mm and for the gentleman 19 mm.

  Grafiek voor gewichtsvergelijking  
  Pt. F.G. 22kt 18kt 14kt 10kt 9kt F.S. Stg
Pt. 1.00 0.90 0.82 0.70 0.60 0.53 0.53 0.49 0.48
F.G. 1.11 1.00 0.91 0.78 0.67 0.59 0.58 0.54 0.54
22kt 1.22 1.10 1.00 0.86 0.73 0.65 0.65 0.60 0.59
18kt 1.42 1.28 1.16 1.00 0.85 0.76 0.75 0.69 0.68
14kt 1.66 1.50 1.36 1.17 1.00 0.89 0.88 0.81 0.80
10kt 1.88 1.69 1.54 1.32 1.13 1.00 0.99 0.92 0.90
9kt 1.90 1.71 1.56 1.34 1.14 1.01 1.00 0.93 0.92
F.S. 2.04 1.84 1.68 1.44 1.23 1.09 1.08 1.00 0.99
Stg 2.07 1.87 1.70 1.46 1.25 1.11 1.09 1.01 1.00

  
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