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Ring Size Chart - GemSelect
Circumference
(mm)		 Diameter
(mm)		 Europe UK& Australia United States & Canada China Singapore & Japan Hong Kong Switzerland
44.2 14.1 44 F½ 3 6 4 6 4
44.8 14.3 45 G     5 5 5¼
45.5 15.5   G½ 3½ 7   7.5  
46.1 14.7 46 H     6   6½
46.8 14.9 47 H½ 4 8 7 9  
47.4 15.1   I   9     7¾
48.0 15.3 48 I½ 4½   8 10  
48.7 15.5   J         9
49.3 15.7 49 J½ 5 10 9 11  
50.0 15.9 50 K         10
50.6 16.1   K½ 5½ 11 10 12  
51.2 16.3 51 L         11¾
51.9 16.5 52 L½ 6 12 11 13 12¾
52.5 16.7   M   13 12    
53.1 16.9 53 M½ 6½   13 14.5 14
53.8 17.1   N   14      
54.4 17.3 54 N½ 7   14 16 15 ¼
55.1 17.5 55 O   15      
55.7 17.7   O½ 7½   15 17 16½
56.3 17.9 56 P   16      
57.0 18.1 57 P½ 8 17 16   17¾
57.2 18.2           18  
57.6 18.3   Q          
58.3 18.5 58 Q½ 8½ 18 17 19  
58.9 18.8 59 R         19
59.5 19.0   R½ 9 19 18 20.5  
60.2 19.2 60 S   20     20¼
60.8 19.4 61 S½ 9½   19 22  
61.4 19.6   T   21     21½
62.1 19.8 62 T½ 10   20 23  
62.7 20.0   U   22 21    
63.4 20.2 62 U½ 10½   22 24 22¾
64.0 20.4 64 V   23      
64.6 20.6   V½ 11   23 25  
65.3 20.8 65 W   24     25
65.9 21.0 66 W½ 11½ 25 24 26  
66.6 21.2   X          
67.2 21.4 67 X½ 12 26 25 27.75 27½
67.8 21.6   Y          
68.5 21.8 68 Z 12½   26   28¾
69.1 22.0 69 Z½          
69.7 22.2 70   13   27 30  
70.4 22.4   Z+1          
71.0 22.6   Z+2 13½        
  • First Published: April-11-2016
  • Last Updated: January-23-2019
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Gems are always measured in Millimeter (mm)

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length x width x depth,
except for round stones which are;
diameter x depth

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