Jewelry & Natural Gemstones


Ring sizes

There are several systems in use around the world to specify the size of jewelry rings. At Sun Sun Jewelry, all ring sizes are indicated as the inside circumference in millimeters.

For most of our designs, we can resize the ring for you at no additional charge. Please contact us to check if it is possible to resize the ring that you are interested in before placing an order.

Inside diameter Inside circumference Sizes
(inch) (mm) (inch) (mm) United States
and Canada		 United Kingdom,
Ireland,
and Australia		 China,
Japan		 Switzerland
0.459 11.63 1.44 36.5 0
0.466 11.84 1.46 37.2 ¼
0.474 12.04 1.49 37.8 ½ A
0.482 12.24 1.51 38.5 ¾ A½
0.49 12.45 1.54 39.1 1 B 1
0.498 12.65 1.56 39.7 1¼ B½
0.506 12.85 1.59 40.4 1½ C
0.514 13.06 1.61 41.0 1¾ C½
0.522 13.26 1.64 41.7 2 D 2 1.5
0.53 13.46 1.67 42.3 2¼ D½
0.538 13.67 1.69 42.9 2½ E 3 2.75
0.546 13.87 1.72 43.6 2¾ E½
0.554 14.07 1.74 44.2 3 F 4 4
0.562 14.27 1.77 44.8 3¼ F½ 5 5.25
0.57 14.48 1.79 45.5 3½ G
0.578 14.68 1.82 46.1 3¾ G½ 6 6.5
0.586 14.88 1.84 46.8 4 H 7
0.594 15.09 1.87 47.4 4¼ H½ 7.75
0.602 15.29 1.89 48.0 4½ I 8
0.61 15.49 1.92 48.7 4¾ J 9
0.618 15.70 1.94 49.3 5 J½ 9
0.626 15.90 1.97 50.0 5¼ K 10
0.634 16.10 1.99 50.6 5½ K½ 10
0.642 16.31 2.02 51.2 5¾ L 11.75
0.65 16.51 2.04 51.9 6 L½ 11 12.75
0.658 16.71 2.07 52.5 6¼ M 12
0.666 16.92 2.09 53.1 6½ M½ 13 14
0.674 17.12 2.12 53.8 6¾ N
0.682 17.32 2.14 54.4 7 N½ 14 15.25
0.69 17.53 2.17 55.1 7¼ O
0.698 17.73 2.19 55.7 7½ O½ 15 16.5
0.706 17.93 2.22 56.3 7¾ P
0.714 18.14 2.24 57.0 8 P½ 16 17.75
0.722 18.34 2.27 57.6 8¼ Q
0.73 18.54 2.29 58.3 8½ Q½ 17
0.738 18.75 2.32 58.9 8¾ R 19
0.746 18.95 2.34 59.5 9 R½ 18
0.754 19.15 2.37 60.2 9¼ S 20.25
0.762 19.35 2.39 60.8 9½ S½ 19
0.77 19.56 2.42 61.4 9¾ T 21.5
0.778 19.76 2.44 62.1 10 T½ 20
0.786 19.96 2.47 62.7 10¼ U 21
0.794 20.17 2.49 63.4 10½ U½ 22 22.75
0.802 20.37 2.52 64.0 10¾ V
0.81 20.57 2.54 64.6 11 V½ 23
0.818 20.78 2.57 65.3 11¼ W 25
0.826 20.98 2.59 65.9 11½ W½ 24
0.834 21.18 2.62 66.6 11¾ X
0.842 21.39 2.65 67.2 12 X½ 25 27.5
0.85 21.59 2.67 67.8 12¼ Y
0.858 21.79 2.70 68.5 12½ Z 26 28.75
0.866 22.00 2.72 69.1 12¾ Z½
0.874 22.20 2.75 69.7 13 27
0.882 22.40 2.77 70.4 13¼ Z1
0.89 22.61 2.80 71.0 13½
0.898 22.81 2.82 71.7 13¾ Z2
0.906 23.01 2.85 72.3 14 Z3
0.914 23.22 2.87 72.9 14¼
0.922 23.42 2.90 73.6 14½ Z4
0.93 23.62 2.92 74.2 14¾
0.938 23.83 2.95 74.8 15
0.946 24.03 2.97 75.5 15¼
0.954 24.23 3.00 76.1 15½
0.962 24.43 3.02 76.8 15¾
0.97 24.64 3.05 77.4 16

Courtesy: Wikipedia
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