Diamond Sizes in mm's
Diamond shapes | About Diamonds | The 4 C’s | Certification | Diamond Sizes
All diamond sizes are in mm’s and are approximate
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Round Brilliant Cut Diamonds (diameter)
0.30ct - 4.2
0.40ct – 4.8
0.50ct – 5.0
0.60ct – 5.4
0.70ct – 5.7
0.80ct – 5.9
0.90ct – 6.2
1.00ct – 6.4
1.20ct – 6.8
1.50ct – 7.3
1.70ct – 7.6
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Princess Cut Diamonds (length x width)
0.30ct – 3.5
0.40ct – 3.9
0.50ct – 4.4
0.60ct – 4.5
0.70ct – 4.7
0.80ct – 4.9
0.90ct – 5.0
1.00ct – 5.3
1.20ct – 5.9
1.50ct – 6.0
1.70ct – 6.1
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Emerald Cut Diamonds (length x width)
0.30ct – 5.0 x 3.0
0.40ct – 5.0 x 4.0
0.50ct – 5.5 x 3.5
0.60ct – 6.0 x 4.0
0.70ct – 6.5 x 4.5
0.80ct – 7.0 x 3.0
0.90ct – 7.0 x 4.0
1.00ct – 7.0 x 5.0
1.20ct – 8.0 x 4.0
1.50ct – 8.0 x 5.0
1.70ct – 8.0 x 6.0
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Pear Cut Diamonds (length x width)
0.30ct – 5.0 x 3.0
0.40ct – 5.0 x 4.0
0.50ct – 6.0 x 4.0
0.60ct - 7.0 x 3.0
0.70ct – 7.0 x 5.0
0.80ct – 7.5 x 5.5
0.90ct – 8.0 x 4.0
1.00ct – 8.0 x 5.0
1.20ct – 8.0 x 6.0
1.50ct – 9.0 x 9.0
1.70ct – 9.0 x 9.0
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Oval Cut Diamonds (length x width)
0.30ct – 5.0 x 3.0
0.40ct – 5.0 x 4.0
0.50ct – 6.0 x 4.0
0.60ct – 6.4 x 4.5
0.70ct – 7.0 x 4.0
0.80ct – 7.0 x 5.0
0.90ct – 7.5 x 5.5
1.00ct – 8.0 x 4.0
1.20ct – 8.0 x 6.5
1.50ct – 8.5 x 6.5
1.70ct – 9.0 x 5.0
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Marquise Cut Diamonds (length x width)
0.30ct – 6.0 x 3.0
0.40ct – 7.0 x 4.0
0.50ct – 8.0 x 4.0
0.60ct – 8.0 x 6.0
0.70ct – 9.0 x 4.0
0.80ct – 9.0 x 4.5
0.90ct – 9.0 x 5.0
1.00ct – 10. X 5.0
1.20ct – 10. X 5.0
1.50ct – 11. X 5.0
1.70ct – 11. X 5.5
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