SHAPE CARAT TO MM SIZE CONVERSION CHART (ALSO CZ WT TO MM SIZE)
This chart is for purposes of estimating the mm size and/or carat weights for the more popular gemstone shapes.Actual sizes and weights will vary depending on the individual cut and material of each stone. As a general rule Cubic Zirconia will weigh approximately 70% more than its Diamond weight material.
(mm.) | |||||||||||||||
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CARAT DIA WT | ROUND | OVAL | OCTAGON | PEAR | MARQUISE | HEART | SQUARE | TRILLIANT | |||||||
0.010 | 1.25 | ||||||||||||||
0.020 | 1.50 | ||||||||||||||
0.025 | 1.75 | 1.5 x 1.5 | |||||||||||||
0.040 | 2.00 | 1.75 x 1.75 | |||||||||||||
0.050 | 2.25 | 3 x 1.5 | 2 x 2 | ||||||||||||
0.070 | 2.50 | 3.5 x 2.5 | 2.25 x 2.25 | ||||||||||||
0.080 | 2.75 | 4 x 2 | 2.5 x 2.5 | ||||||||||||
0.110 | 3.00 | 3 x 3 | 2.75 x 2.75 | 3 x 3 | |||||||||||
0.150 | 3.25 | 4 x 3 | 5 x 2.5 | 3 x 3 | |||||||||||
0.180 | 3.50 | 5 x 4 | 3.5 x 3.5 | 3.25 x 3.25 | |||||||||||
0.210 | 3.75 | 3.5 x 3.5 | |||||||||||||
0.250 | 4.00 | 5 x 3 | 5 x 3 | 6 x 3 | 4 x 4 | 3.75 x 3.75 | 4 x 4 | ||||||||
0.300 | 4.25 | 5 x 3 | 4 x 4 | ||||||||||||
0.360 | 4.50 | 5.5 x 3.5 | 5.5 x 3 | 4.5 x 4.5 | 4.25 x 4.25 | 4.5 x 4.5 | |||||||||
0.400 | 4.75 | 5.5 x 3.5 | 7 x 3.5 | 4.5 x 4.5 | 5 x 5 | ||||||||||
0.500 | 5.00 | 6 x 4 | 6 x 4 | 5 x 5 | 4.75 x 4.75 | 5.5 x 5.5 | |||||||||
0.550 | 5.25 | 6 x 4 | 8 x 4 | 5 x 5 | 6 x 6 | ||||||||||
0.750 | 5.75 | 7 x 5 | 6.5 x 4.5 | 7 x 5 | 9 x 4.5 | 6 x 6 | 5.5 x 5.5 | 6.5 x 6.5 | |||||||
1.000 | 6.50 | 7.5 x 5.5 | 7 x 5 | 8 x 5 | 10 x 5 | 6.5 x 6.5 | 6 x 6 | 7 x 7 | |||||||
1.250 | 6.75 | 8 x 6 | 7.5 x 5.5 | 9 x 6 | 6.5 x 6.5 | 7.5 x 7.5 | |||||||||
1.500 | 7.00 | 8.5 x 6.5 | 8 x 6 | 9.6 x 6.5 | 11 x 5.5 | 7 x 7 | 7 x 7 | 8 x 8 | |||||||
2.000 | 8.00 | 9 x 7 | 8.5 x 6.5 | 10 x 7 | 12 x 6 | 8 x 8 | 7.5 x 7.5 | 8.5 x 8.5 | |||||||
2.500 | 8.50 | 9.5 x 7.5 | 9 x 6.5 | 11 x 7 | 13 x 6.5 | 8.5 x 8.5 | 8 x 8 | 9 x 9 | |||||||
3.000 | 9.00 | 10 x 8 | 9 x 7 | 12 x 8 | 14 x 7 | 9 x 9 | 8.5 x 8.5 | 10 x 10 | |||||||
3.500 | 9.50 | 11 x 9 | 10 x 8 | 13 x 8 | 15 x 7.5 | 9.5 x 9.5 | 9 x 9 | 10.5 x 10.5 | |||||||
4.000 | 10.00 | 11.5 x 9.5 | 11 x 9 | 14 x 9 | 16 x 8 | 10 x 10 | 9.5 x 9.5 | 11 x 11 | |||||||
5.000 | 11.00 | 12 x 10 | 12 x 10 | 15 x 10 | 18 x 9 | 11 x 11 | 10 x 10 | 11.5 x 11.5 | |||||||
6.000 | 12.00 | 13 x 10 | 16 x 10 | 19 x 10 | 12 x 12 | 10.5 x 10.5 | 12 x 12 | ||||||||
7.000 | 12.50 | 14 x 10 | 13 x 10 | 17 x 10 | |||||||||||
8.000 | 13.00 | 14 x 12 | 13.5 x 10.5 | 17 x 12 | 20 x 10 | 11 x 11 | 12.5 x 12.5 | ||||||||
9.000 | 13.50 | 14 x 10 | 18 x 11 | 21 x 10 | 13 x 13 | ||||||||||
10.000 | 14.00 | 16 x 12 | 18 x 13 | 22 x 11 | 14 x 14 | 13 x 13 | |||||||||
12.000 | 15.00 | 18 x 13 | 14 x 12 | 19 x 12 | 24 x 12 | 15 x 15 | 14 x 14 | ||||||||
15.000 | 16.00 | 16 x 12 | 23 x 14 | 24 x 14 | 15.5 x 15.5 | 15 x 15 | |||||||||
18.000 | 17.00 | 20 x 15 | 24 x 15 | 25 x 13 | 16 x 16 | 16 x 16 | |||||||||
20.000 | 18.00 | 18 x 13 | 24 x 16 | 26 x 13 | 17 x 17 | 17 x 17 | |||||||||
30.000 | 20.00 | 22 x 16 | 20 x 15 | 25 x 18 | 25 x 18 | 20 x 20 | 21 x 21 | ||||||||
40.000 | 22.00 | 23 x 19 | 22 x 16 | 27 x 18 | 21 x 21 | 22 x 22 | |||||||||
60.000 | 23.00 | 25 X 18 | 24 x 17 | 28 x 19 | 22 x 22 | 23 x 23 |