Cabochon-cut Moissanite Size Chart
Carat to mm size chart for cabochon-cut Moissanite, from 0.25ct to 40ct (at an L/W ratio of 1.5). 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 (Cabochon Cut)
0.25ct
4.64×3.09 mm
4.64×3.09 mm
0.5ct
5.84×3.89 mm
5.84×3.89 mm
0.75ct
6.69×4.46 mm
6.69×4.46 mm
1ct
7.35×4.9 mm
7.35×4.9 mm
1.25ct
7.92×5.28 mm
7.92×5.28 mm
1.5ct
8.42×5.61 mm
8.42×5.61 mm
1.75ct
8.87×5.91 mm
8.87×5.91 mm
2ct
9.27×6.18 mm
9.27×6.18 mm
2.5ct
9.99×6.66 mm
9.99×6.66 mm
3ct
10.61×7.07 mm
10.61×7.07 mm
3.5ct
11.18×7.45 mm
11.18×7.45 mm
4ct
11.69×7.79 mm
11.69×7.79 mm
4.5ct
12.15×8.1 mm
12.15×8.1 mm
5ct
12.59×8.39 mm
12.59×8.39 mm
5.5ct
12.99×8.66 mm
12.99×8.66 mm
6ct
13.37×8.91 mm
13.37×8.91 mm
6.5ct
13.73×9.15 mm
13.73×9.15 mm
7ct
14.07×9.38 mm
14.07×9.38 mm
7.5ct
14.4×9.6 mm
14.4×9.6 mm
8ct
14.72×9.81 mm
14.72×9.81 mm
8.5ct
15.02×10.01 mm
15.02×10.01 mm
9ct
15.3×10.2 mm
15.3×10.2 mm
9.5ct
15.59×10.39 mm
15.59×10.39 mm
10ct
15.86×10.57 mm
15.86×10.57 mm
11ct
16.37×10.91 mm
16.37×10.91 mm
12ct
16.85×11.23 mm
16.85×11.23 mm
13ct
17.3×11.53 mm
17.3×11.53 mm
14ct
17.73×11.82 mm
17.73×11.82 mm
15ct
18.15×12.1 mm
18.15×12.1 mm
16ct
18.54×12.36 mm
18.54×12.36 mm
17ct
18.92×12.61 mm
18.92×12.61 mm
18ct
19.28×12.85 mm
19.28×12.85 mm
19ct
19.64×13.09 mm
19.64×13.09 mm
20ct
19.97×13.31 mm
19.97×13.31 mm
22ct
20.61×13.74 mm
20.61×13.74 mm
24ct
21.23×14.15 mm
21.23×14.15 mm
26ct
21.8×14.53 mm
21.8×14.53 mm
28ct
22.34×14.89 mm
22.34×14.89 mm
30ct
22.86×15.24 mm
22.86×15.24 mm
33ct
23.6×15.73 mm
23.6×15.73 mm
36ct
24.29×16.19 mm
24.29×16.19 mm
40ct
25.16×16.77 mm
25.16×16.77 mm
Length-to-width ratio: 1.5, 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 cabochon-cut Moissanite carat weights to their approximate millimeter (mm) sizes:
| Carat Weight | MM Size |
|---|---|
| 0.25 ct | 4.64×3.09 mm |
| 0.5 ct | 5.84×3.89 mm |
| 0.75 ct | 6.69×4.46 mm |
| 1 ct | 7.35×4.9 mm |
| 1.25 ct | 7.92×5.28 mm |
| 1.5 ct | 8.42×5.61 mm |
| 1.75 ct | 8.87×5.91 mm |
| 2 ct | 9.27×6.18 mm |
| 2.5 ct | 9.99×6.66 mm |
| 3 ct | 10.61×7.07 mm |
| 3.5 ct | 11.18×7.45 mm |
| 4 ct | 11.69×7.79 mm |
| 4.5 ct | 12.15×8.1 mm |
| 5 ct | 12.59×8.39 mm |
| 5.5 ct | 12.99×8.66 mm |
| 6 ct | 13.37×8.91 mm |
| 6.5 ct | 13.73×9.15 mm |
| 7 ct | 14.07×9.38 mm |
| 7.5 ct | 14.4×9.6 mm |
| 8 ct | 14.72×9.81 mm |
| 8.5 ct | 15.02×10.01 mm |
| Carat Weight | MM Size |
|---|---|
| 9 ct | 15.3×10.2 mm |
| 9.5 ct | 15.59×10.39 mm |
| 10 ct | 15.86×10.57 mm |
| 11 ct | 16.37×10.91 mm |
| 12 ct | 16.85×11.23 mm |
| 13 ct | 17.3×11.53 mm |
| 14 ct | 17.73×11.82 mm |
| 15 ct | 18.15×12.1 mm |
| 16 ct | 18.54×12.36 mm |
| 17 ct | 18.92×12.61 mm |
| 18 ct | 19.28×12.85 mm |
| 19 ct | 19.64×13.09 mm |
| 20 ct | 19.97×13.31 mm |
| 22 ct | 20.61×13.74 mm |
| 24 ct | 21.23×14.15 mm |
| 26 ct | 21.8×14.53 mm |
| 28 ct | 22.34×14.89 mm |
| 30 ct | 22.86×15.24 mm |
| 33 ct | 23.6×15.73 mm |
| 36 ct | 24.29×16.19 mm |
| 40 ct | 25.16×16.77 mm |