CascadeUniqueJewelry.com Size Charts - Ring Size Chart, Piercing Gauge Chart, Chain Thickness Gauges, Carat Size Chart

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Italian size

French size

American size

English size

Diameter in cm

Circumference in cm

1.30

4.08

41.50

1.33

4.18

1.33

4.18

2.50

42.75

2.5

1.35

4.24

1.36

4.27

1.40

4.40

1.43

4.49

5.50

45.50

3.5

1.45

4.55

1.46

4.58

6.75

46.75

H-1/2

1.47

4.62

1.49

4.68

4.5

I-1/2

1.53

4.80

1.56

4.90

9.50

49.25

J-1/2

1.58

4.96

1.60

5.02

10.5

50.50

5.5

1.61

5.06

L-1/2

1.62

5.09

11.5

51.50

1.63

5.12

1.65

5.18

12.5

52.5

1.66

5.21

6.5

1.68

5.28

13.5

53.50

1.70

5.34

1.72

5.40

14.5

54.50

1.73

5.43

1.74

5.46

15.5

55.50

1.76

5.53

7.5

1.78

5.59

16.5

56.50

1.80

5.65

1.81

5.68

17.5

57.50

1.83

5.75

1.85

5.81

18.5

58.50

8.5

1.86

5.84

1.88

5.90

19.5

59.75

1.90

5.97

1.92

6.03

20.5

60.50

1.93

6.06

9.5

1.95

6.12

21.5

61.50

1.96

6.15

T-1/2

1.98

6.22

22.5

62.50

1.99

6.25

6.28

23.5

63.50

10.5

U-1/2

2.02

6.34

2.04

6.41

24.5

64.50

2.05

6.44

2.06

6.47

25.5

65.50

2.08

6.53

2.10

6.59

26.5

66.25

11.5

2.11

6.63

2.12

6.66

27.5

67.50

2.13

6.69

2.15

6.75

28.5

68.75

12.5

2.17

6.81

2.19

6.88

29.5

69.50

2.20

6.91

2.22

6.97

2.25

7.07

2.33

7.32

2.29

7.19

Conversion Table: mm to inches (all measurements are approximate)
mm	inches (approximate)
1 mm	1/32"
2 mm	1/16"
3 mm	3/32"
4 mm	1/8"
5 mm	3/16"
6 mm	just under 1/4"
7 mm	just over 1/4"
8 mm	5/16"
9 mm	just under 3/8"
10 mm	just over 3/8"
11 mm	7/16"
12 mm	just under 1/2"
13 mm	just over 1/2"
14 mm	9/16"
15 mm	just under 5/8"
16 mm	5/8"
17 mm	just under 11/16"
18 mm	just under 3/4"

Following is a chart of industry chain thickness designations based on the number in their SKU (60,120,280, etc)

Chain Thickness Gauges^*
60	2.6mm
80	3mm
100	4mm
120	4.8mm
150	4.8mm
180	7mm
210	7.6mm
250	9.4mm

^* Chain thickness measurements may vary from these but these are a good guideline.

Conversion Table: Common Piercing Gauge Scale (all measurements are approximate, for a guide only not for official use)
Gauge Size	Inch/MM Equivalence (approximate)
12	0.081 in./ 2.057 mm
13	0.095 in. /0.095 mm
14	0.083 in./ 2.108 mm
15	0.072 in./ 1.829 mm
16	0.065 in./ 1.651 mm
17	0.058 in./ 1.473 mm
18	0.049 in./ 1.245 mm
19	0.042 in./ 1.067
20	0.035 in./ 0.889 mm

Millimeter (mm) to Carat (ct) Gemstone Conversion Chart
Carat Size	Round/Square Brilliant/Princess	Pear	Marquise	Oval	Emerald	Heart	Trillion
0.25	4.1		6 x 3	5 x 3	5 x 3	4 x 4	4.5 x 4.5 x 4.5
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	10 x 10 x 10
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
4.50	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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