Please note that with this chart you can find your ring size by measuring your ring or finger with a string and then measuring the string and comparing it to the Circum./cm column! If you already have a ring that is the same size as the one you want to order, measure its inner diameter in millimeters. If you do not have a similar ring, wrap a piece of non-elastic thread around the finger that you want to wear the ring on and then measure the thread in millimeters. Once you have the measurement, find the corresponding value in the Circum./cm column (1mm = 0.01cm) and you should be able to determine the correct size that you need to order.

Ring Size Chart Italian Size French Size American Sz. English Size Diameter/cm Circum./cm 1 41   B 1.30 4.08 2 41.5 2 D 1.33 4.18 2 42   D 1.33 4.18 2.5 42.75 2.5 E 1.35 4.24 3 43     1.36 4.27 4 44 3 F 1.40 4.40 5 45     1.43 4.49 5.5 45.5 3.5 G 1.45 4.55 6 46   H 1.46 4.58 6.75 46.75 4 H-1/2 1.47 4.62 7 47   I 1.49 4.68 8 48 4.5 I-1/2 1.53 4.80 9 49   J 1.56 4.90 9.5 49.25 5 J-1/2 1.58 4.96 10 50   K 1.60 5.02 10.5 50.5 5.5 L 1.61 5.06 11 51   L-1/2 1.62 5.09 Italian Size French Size American Sz. English Size Diameter/cm Circum./cm 11.5 51.5 6 M 1.63 5.12 12 52     1.65 5.18 12.5 52.5     1.66 5.21 13 53 6.5 N 1.68 5.28 13.5 53.5     1.70 5.34 14 54     1.72 5.40 14.5 54.5 7 O 1.73 5.43 15 55     1.74 5.46 15.5 55.5     1.76 5.53 16 56 7.5 P 1.78 5.59 16.5 56.5     1.80 5.65 17 57 8 Q 1.81 5.68 17.5 57.5     1.83 5.75 18 58     1.85 5.81 18.5 58.5 8.5   1.86 5.84 19 59   R 1.88 5.90 19.5 59.75 9   1.90 5.97 20 60   S 1.92 6.03 20.5 60.5     1.93 6.06 21 61 9.5   1.95 6.12 21.5 61.5   T 1.96 6.15 22 62 10 T-1/2 1.98 6.22 Italian Size French Size American Sz. English Size Diameter/cm Circum./cm 22.5 62.5   U 1.99 6.25 23 63     2.00 6.28 23.5 63.5 10.5 U-1/2 2.02 6.34 24 64   V 2.04 6.41 24.5 64.5     2.05 6.44 25 65 11 W 2.06 6.47 25.5 65.5     2.08 6.53 26 66   X 2.10 6.59 26.5 66.25 11.5   2.11 6.63 27 67     2.12 6.66 27.5 67.5 12 Y 2.13 6.69 28 68     2.15 6.75 28.5 68.75 12.5 Z 2.17 6.81 29 69     2.19 6.88 29.5 69.5     2.20 6.91 30 70 13 1 2.22 6.97 31 71   2 2.25 7.07 32 72     2.29 7.19 33 73   3 2.33 7.32
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Millimeter (mm) To Carat (cr) Gemstone Conversion Chart Carat Size Round/Square Pear Marquise Oval Emerald Heart Trillion 0.25 4.1   6 x 3 5 x 3 5 x 3 4 x 4 4.5x4.5x4.5 0.50 5.2 6 x 4 8 x 4 6 x 4 6 x 4 5 x 5 6 x 6 x 6 0.75 5.8 7 x 5 9 x 4.5   6.5 x 4.5 6 x 6   1.00 6.5 8 x 5 10 x 5 7 x 5 7 x 5 6.5 x 6.5   1.25 7.0     7.5 x 5.5       1.50 7.4 9 x 6 11 x 5.5 8 x 6 8 x 6 7 x 7 7 x 7 x 7 2.00 8.2 10 x 7 12 x 6 8.5 x 6.5 8.5 x 6.5 8 x 8 8 x 8 x 8 2.50 8.8 12 x 7 13 x 6.5 9 x 7 9 x 7 8.5 x 8.5 9 x 9 x 9 3.00 9.4 12 x 8 14 x 7 10 x 8 10 x 8 9 x 9 10x10x10 3.50 10.0 13 x 8 14 x 7.5 10 x 8.5   9.5 x 9.5   4.00 10.04 14 x 8 16 x 8 11 x 9 11 x 9 10 x 10   4.5 10.80 14.5 x 9   11 x 9.5   10.5 x 10.5   5.00 11.20 15 x 9 16 x 8.5 12 x 10 12 x 10 11 x 11
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Millimeter To Inch Conversion Table Millimeters Inches 1 1/32" 2 1/16" 3 3/32" 4 1/8" 5 3/16" 6 just under 1/4" 7 just over 1/4" 8 5/16" 9 just under 3/8" 10 just over 3/8" 11 7/16" 12 just under 1/2" 13 just over 1/2" 14 9/16" 15 just under 5/8" 16 5/8" 17 just under 11/16" 18 just under 3/4"	Common Piercing Guage Scale Guage Size Inch/mm 12 0.081/2.057 13 0.095/2.082 14 0.083/2.108 15 0.072/1.829 16 0.065/1.651 17 0.058/1.473 18 0.049/1.245 19 0.042/1.067 20 0.035/0.889
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