Round Cut Size Chart
| Hearts & Arrows Round Cut | Hearts & Arrows Round Cut |
| MM Width | Approximate Carat Weight |
| 4.0mm | 0.25ctw |
| 4.5mm | 0.33ctw |
| 5.0mm | 0.50ctw |
| 5.5mm | 0.65ctw |
| 6.0mm | 0.80ctw |
| 6.5mm | 1.00ctw |
| 7.0mm | 1.20ctw |
| 7.5mm | 1.50ctw |
| 8.0mm | 1.90ctw |
| 8.25mm | 2.00ctw |
| 8.5mm | 2.20ctw |
| 9.0mm | 2.75ctw |
| 9.5mm | 3.25ctw |
| Old European Round Cut | Old European Round Cut |
| MM Width | Approximate Carat Weight |
| 5.0mm | 0.50ctw |
| 5.5mm | 0.60ctw |
| 6.0mm | 0.80ctw |
| 6.5mm | 1.00ctw |
| 7.0mm | 1.25ctw |
| 7.5mm | 1.60ctw |
| 8.0mm | 1.90ctw |
| 8.5mm | 2.40ctw |
| 9.0mm | 2.90ctw |
| 9.5mm | 3.50ctw |
| 10mm | 3.90ctw |
| Round Rose Cut | Round Rose Cut |
| MM Width | Approximate Carat Weight |
| 6.5mm | 0.60ctw |
| 7.0mm | 0.85ctw |
| 7.5mm | 1.10ctw |
| 8.0mm | 1.40ctw |
| 8.5mm | 1.80ctw |
| 9mm | 2.00ctw |