Jewelry Factory
Diamond Size Conversion Chart: Carats to Millimeters
Easily determine the size of a diamond with our comprehensive carat to millimeter conversion chart. This handy reference helps you convert approximate carat weights to their corresponding millimeter measurements for different diamond cuts, including Brilliant, Princess, Marquise, Oval, Pear, and Emerald. Perfect for jewelers, buyers, and enthusiasts to accurately assess diamond sizes.
| BRILLIANT CUT | PRINCESS CUT | MARQUISE CUT | OVAL CUT | PEAR CUT | EMERALD CUT |
|---|---|---|---|---|---|
| 0.06-0.08cts = 2.5mm | 0.06-0.08cts = 2.1-2.2mm | 0.07ct = 4X2mm | 0.15-0.18ct = 4X3mm | 0.15-0.18ct = 4.5X3mm | 0.25ct = 4X3mm |
| 0.10-0.12cts = 3mm | 0.10-0.12cts = 2.5-2.7mm | 0.15ct = 5X2mm | 0.95ct = 5X3mm | 0.25ct = 5X3.5mm | 0.35ct = 5X3mm |
| 0.16-0.18cts = 3.5mm | 0.16-0.18cts = 3mm | 0.20ct = 5X3mm | 0.40ct = 5X4mm | 0.35ct = 5.75X4mm | 0.40ct = 5X3.5mm |
| 0.20-0.22cts = 3.8mm | 0.20-0.22cts = 3.2-3.3mm | 0.25ct = 6X3mm | 0.50ct = 6X4.5mm | 0.40ct = 6X4mm | 0.50ct = 5X4mm |
| 0.24-0.26cts = 4mm | 0.24-0.26cts = 3.4-3.5mm | 0.35ct = 6.5X3.5mm | 0.65ct = 6.5X4.5mm | 0.50ct = 6.5X4.5mm | 0.60ct = 6X3mm |
| 0.30-0.35cts = 4.5mm | 0.30-0.35cts = 3.8-3.9mm | 0.35ct = 7X3mm | 0.75ct = 7X5mm | 0.75ct = 7X5mm | 0.70ct = 6X4mm |
| 0.36-0.38cts = 4.6mm | 0.36-0.38cts = 3.8-3.9mm | 0.40ct = 6.5X4mm | 1.00ct = 7.5X5.5mm | 1.00ct = 8X5mm | 0.80ct = 6.5X4.5mmh |
| 0.48-0.52cts = 5mm | 0.48-0.52cts = 4.3-4.5mm | 0.50ct = 7X4.5mm | 1.25ct = 8X6mm | 1.50ct = 9X6mm | 0.95ct = 7X4mm |
| 0.60-0.62cts = 5.3-5.4mm | 0.60-0.62cts = 4.7mm | 0.70ct = 8X5mm | 1.50ct = 8.5X6.5mm | 1.00ct = 7X5mm | |
| 0.69-0.74cts = 5.6-5.8mm | 0.69-0.74cts = 4.8-4.9mm | 0.70ct = 9X4mm | 1.75ct = 9X6mm | 1.25ct = 7.5X5.5mm | |
| 0.75-0.80cts = 5.9-6mm | 0.75-0.80cts = 4.9-5mm | 0.75ct = 9X4.5mm | 2.00ct = 9X6mm | 1.50ct = 8X5mm | |
| 0.90-0.92cts = 6.2-6.3mm | 0.90-0.92cts = 5.1-5.2mm | 0.80ct = 9X5mm | 2.00ct = 8.5X6.5mm | ||
| 1.00-1.05cts = 6.4-6.5mm | 1.00-1.05cts = 5.3-5.5mm | 1.00ct = 9X6mm | 2.25ct = 9X6mm | ||
| ~1.00cts = 6.6mm | ~1.00cts = 5.8mm | 2.50ct = 9X7mm | |||
| ~1.25cts = 6.8-6.9mm | ~1.25cts = 6mm | ||||
| ~1.30cts = 7mm | ~1.30cts = 6.1mm | ||||
| ~1.40cts = 7.2-7.3mm | ~1.40cts = 6.2mm | ||||
| ~1.50cts = 7.5mm | ~1.50cts = 6.4mm | ||||
| ~1.75cts = 7.7-7.8mm | ~1.75cts = 6.6-6.8mm | ||||
| ~2.00cts = 8-8.2mm | ~2.00cts = 7mm |