Convert Round Moissanite Gemstones From Millimeters To Carat Weight

Need help determining the right size moissanite gemstone for your design? Bookmark this handy reference chart to help you quickly and accurately convert round moissanite stones to their equivalent carat weights.

Last edited: 12/9/2019
Round Moissanite Gemstone
mm Size Average Carat Weight
2.5 0.05
3.0 0.09
3.25 0.11
3.5 0.14
4.0 0.22
4.5 0.29
5.0 0.41
5.5 0.54
6.0 0.68
6.5 0.88
7.0 1.10
7.5 1.35
8.0 1.60
8.5 1.90
9.0 2.26
9.5 2.75
10.0 3.08
10.5 3.57
11.0 4.11
11.5 4.72
12.0 5.32
12.5 6.01
13.0 6.80
13.5 7.60
14.0 8.46
14.5 9.51
15.0 10.46