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Diamond Sizes in mm's

Diamond shapes | About Diamonds | The 4 C’s| Diamond Sizes | Coloured Diamonds

Diamond size = Diamond Carat Weight (roughly speaking)

A common question is 'What size diamond should I buy for the engagement ring?' and there is no set answer.  In most cases the budget determines the size or carat weight of the diamond and so the most popular diamond sizes are from 0.30 carat (1/3 of a carat) up to 0.50 carat (1/2 a carat).

The guide belows gives some average dimensions of diamonds based on their carat weight and can be used as a rough guide.  It is important to consider that once a diamond is 'set' in the ring it appears larger than when it is loose.

The most popular diamond shape is the round brilliant due to it's classic look and wonderful sparkle.  This is followed by the square princess cut, then the emerald cut but the other fancy shaped such as heart, pear, marquise and asscher cut are becoming increasingly popular for those who like something unique.

If you would like any advise please feel free to contact us via our 'contact page' which can be found in the top menu.

 

All diamond sizes are in mm’s and are approximate

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

Princess Cut Diamonds (LxW)

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

 

Emerald Cut Diamonds (LxW)

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

Pear Cut Diamonds (LxW)

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

Oval Cut Diamonds (LxW)

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

Marquise Cut Diamonds (LxW)

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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