Conversion Chart : C.Z. vs. Diamond
( Size in mm., Weight in carat)

Round
SIZE C.Z. weight Diamond weight
1.25 0.013 0.010
1.50 0.023 0.015
1.75 0.037 0.020
2.00 0.06 0.03
2.25 0.08 0.04
2.50 0.10 0.05
2.75 0.15 0.08
3.00 0.18 0.11
3.25 0.24 0.14
3.50 0.29 0.17
3.75 0.36 0.21
4.00 0.43 0.25
4.25 0.48 0.28
4.50 0.61 0.36
4.75 0.74 0.44
5.00 0.79 0.46
5.25 0.95 0.56
5.50 1.13 0.66
5.75 1.30 0.76
6.00 1.43 0.84
6.25 1.58 0.93
6.50 1.75 1.03
6.75 2.11 1.24
7.00 2.17 1.28
7.25 2.53 1.49
7.50 2.84 1.67
7.75 2.97 1.75
8.00 3.46 2.04
8.25 3.58 2.11
8.50 4.13 2.43
8.75 4.34 2.55
9.00 4.68 2.75
9.25 5.18 3.05
9.50 5.69 3.35
9.75 6.13 3.61
10.00 6.58 3.87
10.25 7.08 4.16
10.50 7.50 4.41
10.75 7.55 4.44
11.00 8.35 4.91
11.25 9.34 5.49
11.50 9.94 5.85
12.00 11.62 6.84
12.25 12.34 7.26
12.50 12.52 7.36
12.75 12.78 7.52
13.00 14.47 8.51
13.50 16.20 9.53
14.00 17.84 10.49
15.00 21.92 12.89
16.00 27.25 16.03
17.00 33.55 19.74
18.00 38.60 22.71
19.00 41.78 24.58
20.00 50.22 29.54
22.00 67.43 39.66
25.00 99.18 58.34
30.00 181.77 106.92
40.00 374.15 220.09

Oval
SIZE C.Z. weight Diamond weight
5 x 3 0.35 0.21
5 x 4 0.55 0.32
6 x 4 0.73 0.43
6 x 5 1.04 0.61
7 x 5 1.30 0.76
7.5 x 5.5 1.67 0.98
8 x 6 2.06 1.21
9 x 6 2.40 1.41
9 x 7 3.16 1.86
10 x 8 4.31 2.54
12 x 8 5.09 2.99
10.5 x 8.5 4.90 2.88
11 x 9 6.54 3.85
12 x 10 8.59 5.05
14 x 10 9.87 5.81
13 x 11 10.28 6.05
14 x 12 13.96 8.21
15 x 12 14.89 8.76
16 x 12 15.84 9.32
18 x 13 21.86 12.86
20 x 15 32.17 18.92
22 x 16 40.84 24.02

Heart
SIZE C.Z. weight Diamond weight
4.00 0.40 0.24
4.50 0.57 0.34
5.00 0.75 0.44
5.50 1.03 0.61
6.00 1.25 0.74
6.25 1.41 0.83
6.50 1.58 0.93
7.00 1.92 1.13
7.50 2.71 1.59
8.00 2.90 1.71
9.00 4.10 2.41
9.50 4.93 2.90
10.00 5.38 3.16
11.00 7.50 4.41
12.00 9.63 5.66
13.00 13.40 7.88
14.00 15.95 9.38
15.00 18.34 10.79
16.00 22.56 13.27
18.00 35.50 20.88
20.00 42.01 24.71

Pear
SIZE C.Z. weight Diamond weight
5x4 0.60 0.35
6 x 4 0.67 0.39
6.50 x 4.50 0.97 0.57
7 x 5 1.21 0.71
8 x 5 1.38 0.81
8.5 x 5.5 1.83 1.08
9 x 6 2.26 1.33
9 x 7 2.98 1.75
10 x 7 3.06 1.80
10 x 8 4.19 2.46
11 x 7.50 4.44 2.61
11 x 8 5.10 3.00
12 x 8 5.06 2.98
12 x 9 5.85 3.44
13 x 8 5.04 2.98
14 x 8 5.90 3.47
13 x 9 6.99 4.11
14 x 9 7.01 4.12
15 x 9 8.60 5.06
14 x 10 9.20 5.41
13 x 11 9.61 5.65
15 x 10 9.78 5.75
16 x 10 10.66 6.27
17 x 10 10.99 6.46
15 x 11 12.52 7.36
17 x 11 13.68 8.05
18 x 11 13.84 8.14
16 x 12 15.29 8.99
18 x 12 15.90 9.35
18.5 x 12 17.90 10.53
18 x 13 19.83 11.66
19 x 12 17.00 10.00
19 x 13 20.79 12.23
20 x 14 24.92 14.66
23 x 13 25.89 15.23
22 x 14 26.30 15.47
20 x 15 28.65 16.85
23 x 14 26.00 15.29
25 x 15 30.02 17.66
25 x 20 64.00 37.65

Marquise
SIZE C.Z. weight Diamond weight
4 x 2 0.15 0.08
5 x 2.5 0.24 0.14
6 x 3 0.41 0.24
6.5 x 3.5 0.53 0.31
7 x 3.5 0.60 0.35
8 x 3.5 0.69 0.41
8 x 4 0.80 0.47
9 x 4.5 1.20 0.71
10 x 5 1.62 0.95
11 x 5.5 2.12 1.25
12 x 6 2.75 1.62
13 x 6.5 3.60 2.11
14 x 7 4.22 2.48
15 x 7.5 5.25 3.09
16 x 8 6.57 3.86
17 x 8.5 8.30 4.88
18 x 9 9.61 5.65
20 x 10 13.49 7.94
22 x 11 16.28 9.58
30 x 15 36.50 21.00

Emerald
SIZE C.Z. weight Diamond weight
5 x 3 0.50 0.29
6 x 4 1.13 0.66
6.5 x 4.5 1.49 0.88
7 x 5 1.81 1.06
8 x 6 2.95 1.74
8.5 x 6.5 3.69 2.17
9 x 7 4.46 2.62
9.5 x 7.5 5.46 3.21
10 x 8 6.44 3.79
12 x 8 8.13 4.78
11 x 9 8.85 5.21
13 x 9 10.84 6.38
12 x 10 11.82 6.95
14 x 10 14.42 8.48
13 x 11 15.52 9.13
14 x 12 19.15 11.26
15 x 11 19.51 11.48
16 x 12 24.18 14.22
18 x 13 32.86 19.33
20 x 15 44.03 25.90

Quadrillion / Princess
SIZE C.Z. weight Diamond weight
3.00 0.30 0.18
3.25 0.44 0.26
3.50 0.50 0.29
3.75 0.53 0.31
4.00 0.66 0.39
4.25 0.74 0.44
4.50 0.95 0.56
4.75 1.08 0.64
5.00 1.21 0.71
5.50 1.68 0.99
6.00 2.10 1.24
6.50 2.71 1.59
7.00 3.33 1.96
7.50 4.08 2.40
7.75 4.66 2.74
8.00 5.12 3.01
8.25 5.50 3.24
8.50 6.24 3.67
8.75 6.97 4.10
9.00 7.01 4.12
9.50 8.65 5.09
9.75 9.12 5.36
10.00 9.56 5.62
10.25 10.19 5.99
11.00 12.64 7.44
11.50 16.05 9.44
12.00 16.18 9.52
13.00 21.86 12.86
14.00 25.75 15.15
16.00 40.94 24.08
18.00 55.14 32.44
20.00 72.52 42.66
22.00 99.73 58.66

Trillion
SIZE C.Z. weight Diamond weight
3.50 0.28 0.16
3.75 0.32 0.19
4.00 0.39 0.23
4.25 0.46 0.27
4.50 0.53 0.31
4.75 0.63 0.37
5.00 0.72 0.42
5.25 0.83 0.49
5.50 0.93 0.55
5.75 1.08 0.64
6.00 1.19 0.70
6.25 1.28 0.75
6.50 1.55 0.91
6.75 1.66 0.98
7.00 1.87 1.10
7.50 2.06 1.21
8.00 2.97 1.75
8.50 3.00 1.76
9.00 3.99 2.35
10.00 5.30 3.12
11.00 6.22 3.66
12.00 8.33 4.90
13.00 10.91 6.42

Triangle
SIZE C.Z. weight Diamond weight
3.00 0.21 0.12
3.50 0.30 0.18
4.00 0.40 0.24
4.25 0.54 0.32
4.50 0.63 0.37
5.00 0.76 0.45
5.25 0.90 0.53
5.50 1.13 0.66
5.75 1.20 0.71
6.00 1.30 0.76
6.25 1.46 0.86
6.50 1.60 0.94
6.75 1.73 1.02
7.00 1.89 1.11
7.25 2.25 1.32
7.50 2.47 1.45
7.75 2.88 1.69
8.00 3.04 1.79
8.25 3.16 1.86
9.00 3.66 2.15
9.25 4.32 2.54
9.50 5.13 3.02
9.75 5.52 3.25
10.00 5.98 3.52
10.25 6.17 3.63
11.00 8.05 4.74
12.00 10.25 6.03
13.00 13.80 8.12
14.00 15.94 9.83
15.00 17.92 10.54
20.00 49.44 29.08
25.00 89.96 52.92

Radiant
SIZE C.Z. weight Diamond weight
4.50 x 3.50 0.58 0.34
5 x 3 0.52 0.31
6 x 3 0.70 0.41
6 x 4 1.03 0.60
6.50 x 4.50 1.41 0.83
7 x 5 1.94 1.14
7.5 x 5.5 2.50 1.47
8 x 6 2.96 1.74
8.5 x 6.5 3.80 2.24
9 x 7 4.46 2.62
9.50 x 7.50 5.40 3.18
10 x 8 5.94 3.49
11 x 9 8.58 5.05
12 x 9 10.30 6.06
11.50 x 10 10.97 6.45
12 x 10 11.55 6.79
14 x 10 14.40 8.47
13 x 11 15.86 9.33
13.50 x 11.50 17.32 10.19
14 x 12 20.64 12.14
20 x 10 22.85 13.44
16 x 12 23.08 13.58
18 x 13 33.68 19.81
20 x 15 47.86 28.15
24 x 16 69.60 40.94

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