Carat

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.

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
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