Carat calculator
6.5 mm
Approximate diameter of a round brilliant diamond.
Shown at approximate actual size. Screens vary slightly.
Carat size chart
| Carat | Points | Diameter, round brilliant |
|---|---|---|
| 0.25 ct | 25 points | 4.1 mm |
| 0.33 ct | 33 points | 4.4 mm |
| 0.5 ct | 50 points | 5.1 mm |
| 0.75 ct | 75 points | 5.8 mm |
| 1 ct | 100 points | 6.5 mm |
| 1.25 ct | 125 points | 6.9 mm |
| 1.5 ct | 150 points | 7.4 mm |
| 2 ct | 200 points | 8.1 mm |
| 2.5 ct | 250 points | 8.8 mm |
| 3 ct | 300 points | 9.3 mm |
Carat and karat
Carat (ct) measures a diamond's weight. One carat is 0.2 grams. Karat (k) measures gold purity, such as 22k or 24k.
Two diamonds of the same weight can look different in size, because cut and shape change how large a stone appears. A well cut stone usually looks larger for its weight. Bring your stone to us and we will happily appraise it.