The weight or size of a diamond is measured in carats (ct.). A carat is 0.2 grams and there are 100 points (or 200 milligrams) per carat.

With an accuracy of 1/100,000 ct, the IGI scales provide a highly precise diamond weight and this weight is specified on the Diamond Report to two decimal points.

Cut
Carat		 Clarity
Colour
  carat0.05 carat0.10 carat0.20 carat0.25 carat0.30 carat0.40 carat0.50 carat0.70
Carat 0.05 0.10 0.20 0.25 0.30 0.40 0.50 0.70
Øm/ m 2.5 3.0 3.8 4.1 4.5 4.8 5.2 5.8
h m/ m 1.5 1.8 2.3 2.5 2.7 3.0 3.1 3.5
  carat0.90 carat1.00 carat1.25 carat1.50 carat1.75 carat2.00 carat2.50 carat3.00
Carat 0.90 1.00 1.25 1.50 1.75 2.00 2.50 3.00
Øm/ m 6.3 6.5 6.9 7.4 7.8 8.2 8.8 9.4
h m/ m 3.8 3.9 4.3 4.5 4.7 4.9 5.3 5.6
 
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