What size is a 3/8 caret lightbox stone? or Diamond
A carat is subdivided into 100 points, so a diamond weighing 75 points is a 3/4-carat diamond, 33 points is 1/3-carat, 200 points is a 2 carat etc.
| Fraction | Points | Approximate mm width (round diamonds) | |
| 1/4 carat | = | .23 – .28 | 4.1mm |
| 1/3 carat | = | .29 – .36 | 4.4mm |
| 3/8 carat | = | .37 – .44 | 4.8mm |
| 1/2 carat | = | .45 – .58 | 5.2mm |
| 5/8 carat | = | .59 – .68 | 5.5mm |
| 3/4 carat | = | .69 – .82 | 5.8mm |
| 7/8 carat | = | .83 – .94 | 6.2mm |
| 1.0 carat | = | .95 – 1.05 | 6.5mm |
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