Diamond Size Chart of Round Cut Lab Diamonds
This round cut lab diamond size chart provides a guide for understanding diameter sizes of diamonds in millimeters and their carat weight. The carat weight can vary slightly based on the cut and proportions of the diamond, but this gives a reliable estimate for the typical carat sizes based on the diameter.
| Size(mm) | Carat Weight(ct) |
|---|---|
| 0.80 | 0.0025 |
| 1.00 | 0.005 |
| 1.20 | 0.009 |
| 1.30 | 0.01 |
| 1.50 | 0.015 |
| 1.75 | 0.02 |
| 1.80 | 0.025 |
| 2.00 | 0.03 |
| 2.20 | 0.04 |
| 2.50 | 0.06 |
| 2.75 | 0.08 |
| 3.00 | 0.1 |
| 3.25 | 0.14 |
| 3.50 | 0.17 |
| 3.75 | 0.21 |
| 4.00 | 0.25 |
| 4.25 | 0.28 |
| 4.50 | 0.36 |
| 4.75 | 0.44 |
| 5.00 | 0.5 |
| Size(mm) | Carat Weight(ct) |
|---|---|
| 5.50 | 0.66 |
| 5.75 | 0.75 |
| 6.00 | 0.84 |
| 6.50 | 1 |
| 6.80 | 1.25 |
| 7.00 | 1.3 |
| 7.30 | 1.5 |
| 7.50 | 1.67 |
| 7.75 | 1.75 |
| 8.00 | 2 |
| 8.50 | 2.43 |
| 8.70 | 2.5 |
| 9.00 | 2.75 |
| 9.10 | 3 |
| 9.50 | 3.35 |
| 9.75 | 3.5 |
| 10.00 | 3.87 |
| 10.75 | 4 |
| 11.00 | 4.41 |
| 10.75 | 4.5 |
Millimeter Size (mm): The diameter of the diamond measured in millimeters.
Carat Weight: The weight of the diamond in carats, which is related to the size of the diamond but also influenced by the diamond’s cut and shape.