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Conversion Table

Buying Amber rings and need help to Convert US Size to European size? Below is a conversion table :

           
Diameter (mm) Circumference (mm) USA / Canada UK / Australia Asia Switzerland
Europe / ISO
14.1 44.2 3 F 4 4
14.3 44.8   F-1/2 5 5 1/2
14.5 45.5 3 1/2 G    
14.7 46.1   G-1/2 6 6 1/2
14.9 46.8 4 H 7  
15.1 47.4   H-1/2   7 3/4
15.3 48 4 1/2 I 8  
15.5 48.7   J   9
15.7 49.3 5 J-1/2 9  
15.9 50   K   10
16.1 50.6 5 1/2 K-1/2 10  
16.3 51.2   L   11 3/4
16.5 51.9 6 L-1/2 11 12 3/4
16.7 52.5   M 12  
16.9 53.1 6 1/2 M-1/2 13 14
17.1 53.8   N    
17.3 54.4 7 N-1/2 14 15-1/4
17.5 55.1   O    
17.7 55.7 7 1/2 O-1/2 15 16-1/2
17.9 56.3   P    
18.1 57 8 P-1/2 16 17-3/4
18.3 57.6   Q    
18.5 58.3 8 1/2 Q-1/2 17  
18.8 58.9   R   19
19 59.5 9 R-1/2 18  
19.2 60.2   S   20-1/4
19.4 60.8 9 1/2 S-1/2 19  
19.6 61.4   T   21-1/2
19.8 62.1 10 T-1/2 20  
20 62.7   U 21  
20.2 63.4 10 1/2 U-1/2 22 22-3/4
20.4 64   V    
20.6 64.6 11 V-1/2 23  
20.8 65.3   W   25
21 65.9 11 1/2 W-1/2 24  
21.2 66.6   X    
21.4 67.2 12 X-1/2 25 27-1/2
21.6 67.8   Y    
21.8 68.5 12 1/2 Z 26 28-3/4
22 69.1   Z-1/2    
22.2 69.7 13   27  
22.4 70.4   Z + 1    
22.6 71 13-1/2      
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Comments
7/1/2020 2:21 AM
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