Diamond Weight Calculator

Your details

The cut shape of the diamond. Round uses a diameter; all others use length and width.
Average of the shortest and longest diameter across the girdle.
mm
The distance from the table (top) to the culet (bottom point) of the diamond.
mm
The girdle is the widest edge between crown and pavilion. A thicker girdle adds hidden weight that the dimension formula under-counts.
Optional fine-tuning for unusual features: wide wings (+1 to +10%), pavilion bulge (+1 to +18%), or large culet (+1 to +2%). Leave at 0 for a standard stone.
%
Estimated carat weight1 to 2 ct
1.01ct

Approximate weight based on shape, dimensions, and girdle. Expect +/-5-10% accuracy.

Weight in grams0.201g
Depth percentage60%
Length-to-width ratio1
Cut proportionsBoth depth % and L/W ratio are within the ideal range for this shape.
1.01 ct
Melee (<0.25 ct)<0.251/4 ct range0.25-0.51/2 ct range0.5-11 ct range1-22+ ct2+

Estimated weight: 1.01 ct

  • This Round diamond weighs approximately 1.01 carats (0.201 g). Remember, the estimate carries a +/-5-10% margin of error for most shapes.
  • The depth percentage (60.0%) sits in the ideal 59-62.5% range for this shape, a positive sign for light return and face-up size.
  • For a mid-quality G/H VS2-SI1 stone of this weight, retail prices typically range from $3,870 to $7,739, though actual price depends heavily on cut, colour, clarity, and certification.

Next stepFor a certified weight, have the stone weighed on a calibrated gem scale. A GIA or AGS grading report is the gold standard for confirming carat weight and cut quality.

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