Use our diamond size chart to predict the carat weight by the mm diameter of a round diamond.
Diamond carat size and price chart.
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The 3 carat stone is only twice as heavy and not twice as big.
The surface area is 6 23x6 26mm.
We would calculate the price of that carat by multiplying 2500 x 0 5.
Note the price dip late 2008 the economic crisis and recent stabilization or even rises.
Our round diamond size chart will help you convert millimeter mm size to carat size for round cut diamonds.
The diamond on the left is 1 00 carat and has a good cut.
How to calculate price per carat.
For instance if one carat costs 2500 a 0 5 carat diamond would cost 1250.
The surface area is 6 23x6 2mm.
Diamonds under 4ct never rose as much nor fell as far.
The diamond on the right weighs in at 0 92 carats and has an excellent cut.
The per carat price increases as the weight and the quality increases.
However we need to consider the other cs of a diamond color clarity and cut.
As you can see from the diamond size comparison above a 3 00 carat diamond would have a diameter of 9 00 mm compared to the 7 50 mm diameter a 1 50 carat diamond has.
This round diamond price chart shows changes in diamond prices over the past few years for different sizes.