Our moissanite size chart will help you convert millimeter (mm) size to carat size for moissanite in different shapes.
Round Cut Moissanite
| Size (mm) | Carat Weight (ct) |
| 3.0 | 0.10 |
| 3.25 | 0.15 |
| 3.5 | 0.20 |
| 3.75 | 0.25 |
| 3.8 | 0.26 |
| 4.0 | 0.30 |
| 4.5 | 0.40 |
| 5.0 | 0.50 |
| 5.2 | 0.54 |
| 5.5 | 0.60 |
| 5.7 | 0.70 |
| 6.0 | 0.80 |
| 6.5 | 1.00 |
| 7.0 | 1.20 |
| 7.5 | 1.50 |
| 8.0 | 2.00 |
| 8.5 | 2.50 |
| 9.0 | 3.00 |
| 9.5 | 3.50 |
| 10.0 | 4.00 |
| 10.5 | 4.50 |
| 11.0 | 5.00 |
| 11.5 | 5.50 |
| 12.0 | 6.00 |
| 12. 5 | 7.00 |
| 13.0 | 8.00 |
| 13.5 | 9.00 |
| 14.0 | 10.00 |
| 14.5 | 11.00 |
| 15.0 | 12.00 |
| 16.0/16.5 | 15.00 |
| 18.0 | 20.00 |
Pear Cut Moissanite
| Size (mm) | Carat Weight (ct) |
| 1.5*3 | 0.10 |
| 2.5*4 | 0.20 |
| 3*4 | 0.30 |
| 3*5 | 0.35 |
| 4*6 | 0. 50 |
| 5*7 | 0.80 |
| 5*8 | 1.00 |
| 6*8 | 1.25 |
| 6*9 | 1.50 |
| 7*10 | 2.00 |
| 7*10. 5 | 2.50 |
| 7*11 | 3.00 |
| 8*12 | 4.00 |
| 9*13 | 5.00 |
| 10*14 | 6.00 |
Marquise Cut Moissanite
| Size (mm) | Carat Weight (ct) |
| 1.5*3 | 0.05 |
| 2*4 | 0.10 |
| 2.5*5 | 0.20 |
| 3*6 | 0.30 |
| 4*8 | 0.50 |
| 4.5*9 | 0.80 |
| 5*10 | 1.00 |
| 5.5*11 | 1.50 |
| 6*12 | 2.00 |
| 6.5*13 | 2.50 |
| 7*14 | 3.00 |
Asscher/ Cushion Cut Moissanite
| Size（mm) | Carat Weight（ct) |
| 2.0 | 0.06 |
| 2.5 | 0.08 |
| 3.0 | 0.15 |
| 3.5 | 0.25 |
| 4.0 | 0.35 |
| 4.5 | 0.50 |
| 5.0 | 0.60 |
| 5.5 | 0.80 |
| 6.0 | 1.00 |
| 6,5 | 1.50 |
| 7.0 | 2.00 |
| 7.5 | 2.20 |
| 8.0 | 2.50 |
| 8.5 | 3.00 |
| 9.0 | 3.50 |
| 9.5 | 4.50 |
| 10.0 | 5.00 |
| 10.5 | 6.00 |
| 11.0 | 7.00 |
| 5. 5*6.0 | 1.00 |
| 6.0*7.0 | 1.50 |
| 6. 5*7. 5 | 2,00 |
| 6*8 | 2.00 |
| 7*9 | 3.00 |
Emerald Cut Moissanite
| Size（mm) | Carat Weight（ct) |
| 2*4 | 0.2 |
| 3*5 | 0.5 |
| 4*6 | 0.8 |
| 5*7 | 1 |
| 6*8 | 2 |
| 7*9 | 3 |
| 8*10 | 4 |
| 9*11 | 5 |
| 10*12 | 8 |
| 10*14 | 10 |
| 12*14 | 12 |
Oval Cut Moissanite
| Size（mm) | Carat Weight（ct) |
| 2*4 | 0.1 |
| 3*5 | 0.3 |
| 4*6 | 0.5 |
| 5*7 | 1 |
| 6*8 | 1.5 |
| 7*9 | 2 |
| 8*10 | 3 |
| 8*12 | 4.5 |
| 9*11 | 5 |
| 10*12 | 6 |
| 10*14 | 8 |
Radiant Cut Moissanite
| Size（mm) | Carat Weight（ct) |
| 2*4 | 0.2 |
| 3*5 | 0.5 |
| 4*6 | 0.8 |
| 5*7 | 1 |
| 6*8 | 2 |
| 7*9 | 3 |
| 8*10 | 4 |
| 9*11 | 5 |
| 10*12 | 8 |
| 10*14 | 10 |
Princess Cut Moissanite
| Size（mm) | Carat Weight（ct) |
| 1.5*1.5 | 0.06 |
| 2 | 0.08 |
| 2.5 | 0.15 |
| 3 | 0.3 |
| 3.5 | 0.35 |
| 4 | 0.4 |
| 4.5 | 0.6 |
| 5 | 0.8 |
| 5.5 | 1 |
| 6 | 1.2 |
| 6.5 | 1.5 |
| 7 | 2 |
| 7.5 | 2.5 |
| 8 | 3 |
| 8.5 | 3.5 |
| 9 | 4 |
| 9.5 | 5 |
| 10 | 6 |