Marquise-cut Moissanite Size Chart
Carat to mm size chart for marquise-cut Moissanite, from 0.25ct to 40ct (at an L/W ratio of 2). The chart is interactive, meaning you can click on any stone to view it directly in the size simulator.
Gem sizes are shown in actual, real-world size, provided your device screen size is in diagonal. If this is not correct, change it here:
Gem sizes are shown in actual, real-world size, provided your device screen size is in diagonal. If this is not correct, change it here:
Actual size is set for screen
Gemstone:
Shape:
Moissanite Size Chart (Marquise Cut)
0.25ct
6.58×3.29 mm
6.58×3.29 mm
0.5ct
8.3×4.15 mm
8.3×4.15 mm
0.75ct
9.5×4.75 mm
9.5×4.75 mm
1ct
10.46×5.23 mm
10.46×5.23 mm
1.25ct
11.26×5.63 mm
11.26×5.63 mm
1.5ct
11.96×5.98 mm
11.96×5.98 mm
1.75ct
12.6×6.3 mm
12.6×6.3 mm
2ct
13.16×6.58 mm
13.16×6.58 mm
2.5ct
14.18×7.09 mm
14.18×7.09 mm
3ct
15.08×7.54 mm
15.08×7.54 mm
3.5ct
15.86×7.93 mm
15.86×7.93 mm
4ct
16.6×8.3 mm
16.6×8.3 mm
4.5ct
17.26×8.63 mm
17.26×8.63 mm
5ct
17.88×8.94 mm
17.88×8.94 mm
5.5ct
18.44×9.22 mm
18.44×9.22 mm
6ct
19×9.5 mm
19×9.5 mm
6.5ct
19.5×9.75 mm
19.5×9.75 mm
7ct
20×10 mm
20×10 mm
7.5ct
20.46×10.23 mm
20.46×10.23 mm
8ct
20.9×10.45 mm
20.9×10.45 mm
8.5ct
21.34×10.67 mm
21.34×10.67 mm
9ct
21.74×10.87 mm
21.74×10.87 mm
9.5ct
22.14×11.07 mm
22.14×11.07 mm
10ct
22.52×11.26 mm
22.52×11.26 mm
11ct
23.24×11.62 mm
23.24×11.62 mm
12ct
23.92×11.96 mm
23.92×11.96 mm
13ct
24.58×12.29 mm
24.58×12.29 mm
14ct
25.2×12.6 mm
25.2×12.6 mm
15ct
25.78×12.89 mm
25.78×12.89 mm
16ct
26.34×13.17 mm
26.34×13.17 mm
17ct
26.88×13.44 mm
26.88×13.44 mm
18ct
27.4×13.7 mm
27.4×13.7 mm
19ct
27.88×13.94 mm
27.88×13.94 mm
20ct
28.38×14.19 mm
28.38×14.19 mm
22ct
29.28×14.64 mm
29.28×14.64 mm
24ct
30.14×15.07 mm
30.14×15.07 mm
26ct
30.96×15.48 mm
30.96×15.48 mm
28ct
31.74×15.87 mm
31.74×15.87 mm
30ct
32.48×16.24 mm
32.48×16.24 mm
33ct
33.52×16.76 mm
33.52×16.76 mm
36ct
34.52×17.26 mm
34.52×17.26 mm
40ct
35.74×17.87 mm
35.74×17.87 mm
Length-to-width ratio: 2, Color:
Download Chart
Note: If you want to cut out the shapes and try them on your finger, print out the PDF chart. The image (png) chart will not print at actual size.
Carat-to-MM Conversion Table
Use this conversion table to quickly convert marquise-cut Moissanite carat weights to their approximate millimeter (mm) sizes:
| Carat Weight | MM Size |
|---|---|
| 0.25 ct | 6.58×3.29 mm |
| 0.5 ct | 8.3×4.15 mm |
| 0.75 ct | 9.5×4.75 mm |
| 1 ct | 10.46×5.23 mm |
| 1.25 ct | 11.26×5.63 mm |
| 1.5 ct | 11.96×5.98 mm |
| 1.75 ct | 12.6×6.3 mm |
| 2 ct | 13.16×6.58 mm |
| 2.5 ct | 14.18×7.09 mm |
| 3 ct | 15.08×7.54 mm |
| 3.5 ct | 15.86×7.93 mm |
| 4 ct | 16.6×8.3 mm |
| 4.5 ct | 17.26×8.63 mm |
| 5 ct | 17.88×8.94 mm |
| 5.5 ct | 18.44×9.22 mm |
| 6 ct | 19×9.5 mm |
| 6.5 ct | 19.5×9.75 mm |
| 7 ct | 20×10 mm |
| 7.5 ct | 20.46×10.23 mm |
| 8 ct | 20.9×10.45 mm |
| 8.5 ct | 21.34×10.67 mm |
| Carat Weight | MM Size |
|---|---|
| 9 ct | 21.74×10.87 mm |
| 9.5 ct | 22.14×11.07 mm |
| 10 ct | 22.52×11.26 mm |
| 11 ct | 23.24×11.62 mm |
| 12 ct | 23.92×11.96 mm |
| 13 ct | 24.58×12.29 mm |
| 14 ct | 25.2×12.6 mm |
| 15 ct | 25.78×12.89 mm |
| 16 ct | 26.34×13.17 mm |
| 17 ct | 26.88×13.44 mm |
| 18 ct | 27.4×13.7 mm |
| 19 ct | 27.88×13.94 mm |
| 20 ct | 28.38×14.19 mm |
| 22 ct | 29.28×14.64 mm |
| 24 ct | 30.14×15.07 mm |
| 26 ct | 30.96×15.48 mm |
| 28 ct | 31.74×15.87 mm |
| 30 ct | 32.48×16.24 mm |
| 33 ct | 33.52×16.76 mm |
| 36 ct | 34.52×17.26 mm |
| 40 ct | 35.74×17.87 mm |