Round Cut Conversion

 
Hearts & Arrows Round Cut MM Size Hearts & Arrows Round Cut 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
10.0mm 3.60ctw
10.5mm 4.20ctw
11.0mm 4.90ctw
11.5mm 5.60ctw
12.0mm 6.25ctw
12.5mm 7.00ctw
13.0mm 8.00ctw
14.0mm 9.00ctw
 
 
Old European Round Cut MM Size Old European Round Cut 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 MM Size Round Rose Cut Approximate Carat Weight
3.0mm 0.10ctw
4.0mm 0.20ctw
5.0mm 0.30ctw
5.5mm 0.35ctw
6.0mm 0.40ctw
6.5mm 0.60ctw
7.0mm 0.85ctw
7.5mm 1.10ctw
8.0mm 1.40ctw
8.5mm 1.80ctw
9mm 2.00ctw
9.5mm 2.30ctw
10.0mm 2.60ctw
10.5mm 3.00ctw
11.0mm 3.50ctw