For round diamonds, you can use the following formula to estimate their carat weight: Weight in carats = Diameter in mm x Diameter in mm x Depth in mm x 0.006 The diameter of a round stone is measured as a straight line that goes through the stone’s center and connects two points on the diamond’s girdle (outer edge).

How to calculate a diamond’s weight in carats?

To establish the weight of your diamond:

  • Measure the length, width and height of your diamond in mm.
  • Enter the measurements in our diamond calculator.
  • Find out the carat weight of your diamond.
  • Compute The Carat Weight Of A Gem

    This video shows how to compute the carat weight for a gem based on its shape (e.g. teardrop or oval) its dimensions and the …

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