Moissanite Size Guide
Moissanite vs Diamond Size Guide
Moissanite weighs approximately 15% less than diamond, so sizes are compared using millimeter dimensions rather than carat weight. Select a cut below to explore.
Round Brilliant Cut
The most popular and classic diamond shape
| Moissanite Size | Moissanite Weight | Diamond Equivalent |
|---|---|---|
| 4.0mm | 0.20ct | 0.25ct |
| 4.5mm | 0.30ct | 0.33ct |
| 5.0mm | 0.40ct | 0.50ct |
| 5.5mm | 0.55ct | 0.66ct |
| 6.0mm | 0.70ct | 0.80ct |
| 6.5mm | 0.88ct | 1.00ct |
| 7.0mm | 1.10ct | 1.25ct |
| 7.5mm | 1.30ct | 1.50ct |
| 8.0mm | 1.60ct | 2.00ct |
| 8.5mm | 1.90ct | 2.50ct |
| 9.0mm | 2.20ct | 2.75ct |
| 10.0mm | 2.80ct | 3.50ct |
Cushion Cut
Romantic vintage-inspired shape with rounded corners
| Moissanite Size | Moissanite Weight | Diamond Equivalent |
|---|---|---|
| 5.0mm | 0.50ct | 0.75ct |
| 5.5mm | 0.75ct | 1.00ct |
| 6.0mm | 1.00ct | 1.25ct |
| 6.5mm | 1.25ct | 1.50ct |
| 7.0mm | 1.50ct | 2.00ct |
| 7.5mm | 1.75ct | 2.25ct |
| 8.0mm | 2.00ct | 2.50ct |
| 9.0mm | 2.75ct | 3.50ct |
| 10.0mm | 3.50ct | 4.50ct |
Oval Cut
Elongated shape that creates the illusion of length
| Moissanite Size | Moissanite Weight | Diamond Equivalent |
|---|---|---|
| 5×3mm | 0.25ct | 0.33ct |
| 6×4mm | 0.50ct | 0.66ct |
| 7×5mm | 0.80ct | 1.00ct |
| 8×6mm | 1.25ct | 1.50ct |
| 9×7mm | 1.75ct | 2.00ct |
| 10×8mm | 2.50ct | 3.00ct |
| 11×9mm | 3.25ct | 4.00ct |
| 12×10mm | 4.25ct | 5.00ct |
Emerald Cut
Sophisticated step-cut with clean lines
| Moissanite Size | Moissanite Weight | Diamond Equivalent |
|---|---|---|
| 5×3mm | 0.35ct | 0.50ct |
| 6×4mm | 0.65ct | 0.75ct |
| 7×5mm | 1.00ct | 1.25ct |
| 8×6mm | 1.50ct | 2.00ct |
| 9×7mm | 2.25ct | 2.75ct |
| 10×8mm | 3.00ct | 3.50ct |
| 11×9mm | 3.75ct | 4.50ct |
| 12×10mm | 4.75ct | 5.50ct |
Radiant Cut
Brilliant facets with trimmed corners
| Moissanite Size | Moissanite Weight | Diamond Equivalent |
|---|---|---|
| 5×3mm | 0.35ct | 0.50ct |
| 6×4mm | 0.65ct | 0.75ct |
| 7×5mm | 1.00ct | 1.25ct |
| 8×6mm | 1.50ct | 2.00ct |
| 9×7mm | 2.25ct | 2.75ct |
| 10×8mm | 3.00ct | 3.50ct |
| 11×9mm | 3.75ct | 4.50ct |
| 12×10mm | 4.75ct | 5.50ct |
Pear Cut
Teardrop shape combining round and marquise
| Moissanite Size | Moissanite Weight | Diamond Equivalent |
|---|---|---|
| 5×3mm | 0.25ct | 0.33ct |
| 6×4mm | 0.50ct | 0.66ct |
| 7×5mm | 0.80ct | 1.00ct |
| 8×6mm | 1.25ct | 1.50ct |
| 9×7mm | 1.75ct | 2.00ct |
| 10×8mm | 2.50ct | 3.00ct |
| 11×9mm | 3.25ct | 4.00ct |
| 12×10mm | 4.25ct | 5.00ct |
Marquise Cut
Elongated shape with pointed ends
| Moissanite Size | Moissanite Weight | Diamond Equivalent |
|---|---|---|
| 6×3mm | 0.25ct | 0.33ct |
| 8×4mm | 0.50ct | 0.66ct |
| 10×5mm | 0.80ct | 1.00ct |
| 12×6mm | 1.25ct | 1.50ct |
| 14×7mm | 1.75ct | 2.00ct |
| 16×8mm | 2.50ct | 3.00ct |
| 18×9mm | 3.25ct | 4.00ct |
Princess Cut
Modern square shape with brilliant facets
| Moissanite Size | Moissanite Weight | Diamond Equivalent |
|---|---|---|
| 4.0mm | 0.40ct | 0.50ct |
| 4.5mm | 0.55ct | 0.75ct |
| 5.0mm | 0.75ct | 1.00ct |
| 5.5mm | 1.00ct | 1.25ct |
| 6.0mm | 1.25ct | 1.50ct |
| 6.5mm | 1.50ct | 2.00ct |
| 7.0mm | 1.75ct | 2.25ct |
| 8.0mm | 2.50ct | 3.00ct |
Asscher Cut
Art deco square step-cut with cropped corners
| Moissanite Size | Moissanite Weight | Diamond Equivalent |
|---|---|---|
| 4.0mm | 0.40ct | 0.50ct |
| 5.0mm | 0.75ct | 1.00ct |
| 6.0mm | 1.25ct | 1.50ct |
| 7.0mm | 1.75ct | 2.25ct |
| 8.0mm | 2.50ct | 3.00ct |
| 9.0mm | 3.25ct | 4.00ct |
| 10.0mm | 4.25ct | 5.00ct |
