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.
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| 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 |
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| 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 |