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CARAT CONVERSION

A guide to compare a diamond’s carat weight to its approximate top dimensions.

In the case of brilliant cut diamonds, the millimetre value refers to the stone’s diameter. For princess cut diamonds, the millimetre value means that dimension square. Please note this is only a rough guide as the weight of the stone will vary depending upon its depth.

 

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 0.25ct = 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
0.27-0.29cts = 4.2mm 0.27-0.29cts = 3.5mm 0.35ct = 7X3mm 0.75ct = 7X5mm 0.75ct = 7X5mm 0.70ct = 6X4mm
0.30-0.35cts = 4.5mm 0.30-0.35cts = 3.8-3.9mm 0.40ct = 6.5X4mm 1.00ct = 7.5X5.5mm 1.00ct = 8X5mm 0.80ct = 6.5X4.5mm
0.36-0.38cts = 4.6mm 0.36-0.38cts = 3.8-3.9mm 0.50ct = 7X4.5mm 1.25ct = 8X6mm 1.50ct = 9X6mm 0.95ct = 7X4mm
0.39-0.43cts = 4.7-4.8mm 0.39-0.43cts = 3.9-4.1mm 0.70ct = 8X5mm 1.50ct = 8.5X6.5mm 1.00ct = 7X5mm
0.44-0.47cts = 4.8-4.9mm 0.44-0.47cts = 4.1-4.3mm 0.70ct = 9X4mm 1.75ct = 9X6mm 1.25ct = 7.5X5.5mm
 0.48-0.52cts = 5mm  0.48-0.52cts = 4.3-4.5mm  0.75ct = 9X4.5mm  2.00ct = 9X6mm  1.50ct = 8X5mm
 0.53-0.59ctsct = 5.2mm  0.53-0.59ctsct = 4.6mm 0.80ct = 9X5mm  2.00ct = 8.5X6.5mm
 0.60-0.62cts = 5.3-5.4mm  0.60-0.62cts = 4.7mm  1.00ct = 9X6mm  2.25ct = 9X6mm
 0.63-0.68ctsct = 5.5-5.6mm  0.63-0.68ctsct = 4.8mm  2.50ct = 9X7mm
 0.69-0.74cts = 5.6-5.8mm  0.69-0.74cts = 4.8-4.9mm
 0.75-0.80cts = 5.9-6mm  0.75-0.80cts = 4.9-5mm
 0.90-0.92cts = 6.2-6.3mm  0.90-0.92cts = 5.1-5.2mm
 0.93cts-0.99cts = 6.3-6.4mm  0.93cts-0.99cts = 5.2-5.3mm
1.0cts-1.05cts = 6.4-6.5mm 1.0cts-1.05cts = 5.3-5.5mm
Approx 1.1cts = 6.6mm Approx 1.1cts = 5.8mm
Approx 1.25cts = 6.8-6.9mm Approx 1.25cts = 6mm
Approx 1.3cts = 7mm Approx 1.3cts = 6.1mm
Approx 1.4cts = 7.2-7.3mm Approx 1.4cts = 6.2mm
Approx 1.5cts = 7.5mm Approx 1.5cts = 6.4mm
Approx 1.75cts = 7.7-7.8mm Approx 1.75cts = 6.6-6.8mm
Approx 2cts = 8-8.2mm Approx 2cts = 7mm


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