Weight by Shape

Round Brilliant
MM		 Diamond
Avg. Weight Cts		 Ruby/ Sapphire
Avg. Weight Cts
1 0.005 0.006
1.1 0.006 0.007
1.2 0.007 0.010
1.3 0.009 0.011
1.4 0.011 0.014
1.5 0.014 0.017
1.6 0.017 0.018
1.7 0.020 0.024
1.8 0.024 0.029
1.9 0.027 0.034
2 0.031 0.040
2.1 0.036 0.045
2.2 0.041 0.056
2.3 0.044 0.063
2.4. 0.050 0.071
2.5 0.060 0.083
2.6 0.070 0.091
2.7 0.080 0.100
2.8 0.090 0.125
2.9 0.100 0.125
3 0.110 0.143
3.5 0.170 0.220
4 0.240 0.300
4.5 0.340 0.430
4.75 0.400 0.500
5 0.470 0.600
5.25 0.550 0.700
5.5 0.630 0.800
5.75 0.720 0.910
6 0.820 1.050
6.5 1.050 1350


Oval Diamond
Avg. Weight Cts		 Ruby/ Sapphire
Avg. Weight Cts
Length mm Width mm
4.0 3.0 0.17 0.24
5.0 3.0 0.28 0.35
5.0 4.0 0.35 0.45
6.0 4.0 0.50 0.65
6.0 5.0 0.65 0.85
7.0 5.0 0.82 1.05
8.0 6.0 1.23 1.55
9.0 7.0 1.90 2.45


Pear Diamond
Avg. Weight Cts		 Ruby/ Sapphire
Avg. Weight Cts
Length mm Width mm
4.0 3.0 0.16 0.25
5.0 3.0 0.25 0.30
6.0 4.0 0.40 0.50
7.0 5.0 0.65 0.80
8.0 5.0 0.85 1.05
8.0 6.0 1.05 1.31
9.0 6.0 1.25 1.55
9.0 7.0 1.45 1.80


Emerald Diamond
Avg. Weight Cts		 Ruby/ Sapphire
Avg. Weight Cts
Length mm Width mm
5.0 3.0 0.35 0.45
5.0 5.0 0.50 0.60
6.0 4.0 0.65 0.85
6.0 6.0 0.85 1.05
7.0 5.0 1.04 1.30
7.0 7.0 1.30 1.65
8.0 6.0 1.55 2.00
8.0 8.0 1.90 2.40
9.0 7.0 2.30 3.00
9.0 9.0 2.90 3.70