MM to Carat Weight Conversion Charts

Round

European, Mine, Portuguese, Lonestar, Sunburst

Size (mm)CZ ct wtDiamond ct wt
1.250.0130.010
1.250.0130.010
1.500.0230.015
1.750.0370.020
2.000.060.03
2.250.080.04
2.500.100.05
2.750.150.08
3.000.180.11
3.500.290.17
4.000.430.25
4.500.610.36
5.000.790.46
5.501.130.66
6.001.430.84
6.501.751.03
7.002.171.28
7.502.841.67
8.003.462.04
8.504.132.43
9.004.682.75
9.505.693.35
10.006.583.87
10.507.504.41
11.008.354.91
11.509.945.85
12.0011.626.84
12.5012.527.36
13.0014.478.51
13.5016.209.53
14.0017.8410.49
15.0021.9212.89
16.0027.2516.03
17.0033.5519.74
18.0038.6022.71
19.0041.7824.58
20.0050.2229.54
22.0067.4339.66
25.0099.1858.34
30.00181.77106.92
40.00374.15220.09

Princess

Quadrillion, Cushion, Asscher, Flanders

Size (mm)CZ ct wtDiamond ct wt
3.000.300.18
3.500.500.29
4.000.660.39
4.500.950.56
5.001.210.71
5.501.680.99
6.002.101.24
6.502.711.59
7.003.331.96
7.504.082.40
8.005.123.01
8.506.243.67
9.007.014.12
9.508.655.09
10.009.565.62
11.0012.647.44
12.0016.189.52
13.0021.8612.86
14.0025.7515.15
16.0040.9424.08
18.0055.1432.44
20.0072.5242.66
22.0099.7358.66
3.000.300.18

Emerald

Size (mm)CZ ct wtDiamond ct wt
5 x 30.500.29
6 x 41.130.66
6.5 x 4.51.490.88
7 x 51.811.06
8 x 62.951.74
8.5 x 6.53.692.17
9 x 74.462.62
9.5 x 7.55.463.21
10 x 86.443.79
12 x 88.134.78
11 x 98.855.21
13 x 910.846.38
12 x 1011.826.95
14 x 1014.428.48
13 x 1115.529.13
14 x 1219.1511.26
15 x 1119.5111.48
16 x 1224.1814.22
18 x 1332.8619.33
20 x 1544.0325.90

Oval

Size (mm)CZ ct wtDiamond ct wt
5x30.350.21
5x40.550.32
6x40.730.43
6x51.040.61
7x51.300.76
7.5x5.51.670.98
8x62.061.21
9x62.401.41
9x73.161.86
10x84.312.54
10.5x8.54.902.88
12x85.092.99
11x96.403.85
12x108.595.05
14x109.875.81
13x1110.286.05
14x1213.968.21
15x1214.898.76
16x1215.849.32
18x1321.8612.86
20x1532.1718.92
22x1640.8424.02

Heart

Size (mm)CZ ct wtDiamond ct wt
4.000.400.24
4.500.570.34
5.000.750.44
5.501.030.61
6.001.250.74
6.251.410.83
6.501.580.93
7.001.921.13
7.502.711.59
8.002.901.71
9.004.102.41
10.005.383.16
11.007.504.41
12.009.635.66
13.0013.407.88
14.0015.959.38
15.0018.3410.79
16.0022.5613.27
18.0035.5020.88
20.0042.0124.71

Marquise

Size (mm)CZ ct wtDiamond ct wt
6x30.410.24
6.5x3.50.530.31
7x3.50.600.35
8x3.50.690.41
8x40.800.47
9x4.51.200.71
10x51.620.95
11x5.52.121.25
12x62.751.62
13x6.53.602.11
14x74.222.48
15x7.55.253.09
16x86.573.86
17x8.58.304.88
18x99.615.65
20x1013.497.94
22x1116.289.58
30x1536.5021.00

Pear

Size (mm)CZ ct wtDiamond ct wt
5x40.600.35
6x40.670.39
6.5x4.50.970.57
7x51.210.71
8x51.380.81
8.5x5.51.831.08
9x62.261.33
9x72.981.75
10x73.061.80
10x84.192.46
11x7.54.442.61
11x85.103.00
12x85.062.98
12x95.853.44
13x85.042.98
14x85.903.47
13x96.994.11
14x97.014.12
15x98.605.06
14x109.205.41
13x119.615.65
15x109.785.75
16x1010.666.27
17x1010.996.46
15x1112.527.36
17x1113.868.05
18x1113.848.14
16x1215.298.99
18x1215.909.35
18x1319.8311.66
19x1217.0010.00
19x1320.7912.23
20x1424.9214.66
23x1325.8915.23
22x1426.3015.47
20x1528.6516.85
23x1426.0025.29
25x1530.0217.66
25x2064.0037.65

Trillion

Size (mm)CZ ct wtDiamond ct wt
3.500.280.16
4.000.390.23
4.500.530.31
5.000.720.42
5.500.930.55
6.001.190.70
6.501.550.91
7.001.871.10
7.502.061.21
8.002.971.75
8.5003.001.76
9.003.992.35
10.005.303.12
11.006.223.66
12.008.334.90
13.0010.916.42