Cabochon-cut Spinel Size Chart
Carat to mm size chart for cabochon-cut Spinel, 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:
Spinel Size Chart (Cabochon Cut)
0.25ct
4.47×2.98 mm
4.47×2.98 mm
0.5ct
5.63×3.75 mm
5.63×3.75 mm
0.75ct
6.44×4.29 mm
6.44×4.29 mm
1ct
7.1×4.73 mm
7.1×4.73 mm
1.25ct
7.64×5.09 mm
7.64×5.09 mm
1.5ct
8.12×5.41 mm
8.12×5.41 mm
1.75ct
8.54×5.69 mm
8.54×5.69 mm
2ct
8.93×5.95 mm
8.93×5.95 mm
2.5ct
9.62×6.41 mm
9.62×6.41 mm
3ct
10.23×6.82 mm
10.23×6.82 mm
3.5ct
10.76×7.17 mm
10.76×7.17 mm
4ct
11.25×7.5 mm
11.25×7.5 mm
4.5ct
11.7×7.8 mm
11.7×7.8 mm
5ct
12.12×8.08 mm
12.12×8.08 mm
5.5ct
12.51×8.34 mm
12.51×8.34 mm
6ct
12.89×8.59 mm
12.89×8.59 mm
6.5ct
13.23×8.82 mm
13.23×8.82 mm
7ct
13.56×9.04 mm
13.56×9.04 mm
7.5ct
13.88×9.25 mm
13.88×9.25 mm
8ct
14.18×9.45 mm
14.18×9.45 mm
8.5ct
14.46×9.64 mm
14.46×9.64 mm
9ct
14.75×9.83 mm
14.75×9.83 mm
9.5ct
15.02×10.01 mm
15.02×10.01 mm
10ct
15.27×10.18 mm
15.27×10.18 mm
11ct
15.77×10.51 mm
15.77×10.51 mm
12ct
16.23×10.82 mm
16.23×10.82 mm
13ct
16.67×11.11 mm
16.67×11.11 mm
14ct
17.09×11.39 mm
17.09×11.39 mm
15ct
17.48×11.65 mm
17.48×11.65 mm
16ct
17.87×11.91 mm
17.87×11.91 mm
17ct
18.23×12.15 mm
18.23×12.15 mm
18ct
18.57×12.38 mm
18.57×12.38 mm
19ct
18.92×12.61 mm
18.92×12.61 mm
20ct
19.25×12.83 mm
19.25×12.83 mm
22ct
19.86×13.24 mm
19.86×13.24 mm
24ct
20.45×13.63 mm
20.45×13.63 mm
26ct
21×14 mm
21×14 mm
28ct
21.53×14.35 mm
21.53×14.35 mm
30ct
22.02×14.68 mm
22.02×14.68 mm
33ct
22.74×15.16 mm
22.74×15.16 mm
36ct
23.4×15.6 mm
23.4×15.6 mm
40ct
24.24×16.16 mm
24.24×16.16 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 Spinel carat weights to their approximate millimeter (mm) sizes:
| Carat Weight | MM Size |
|---|---|
| 0.25 ct | 4.47×2.98 mm |
| 0.5 ct | 5.63×3.75 mm |
| 0.75 ct | 6.44×4.29 mm |
| 1 ct | 7.1×4.73 mm |
| 1.25 ct | 7.64×5.09 mm |
| 1.5 ct | 8.12×5.41 mm |
| 1.75 ct | 8.54×5.69 mm |
| 2 ct | 8.93×5.95 mm |
| 2.5 ct | 9.62×6.41 mm |
| 3 ct | 10.23×6.82 mm |
| 3.5 ct | 10.76×7.17 mm |
| 4 ct | 11.25×7.5 mm |
| 4.5 ct | 11.7×7.8 mm |
| 5 ct | 12.12×8.08 mm |
| 5.5 ct | 12.51×8.34 mm |
| 6 ct | 12.89×8.59 mm |
| 6.5 ct | 13.23×8.82 mm |
| 7 ct | 13.56×9.04 mm |
| 7.5 ct | 13.88×9.25 mm |
| 8 ct | 14.18×9.45 mm |
| 8.5 ct | 14.46×9.64 mm |
| Carat Weight | MM Size |
|---|---|
| 9 ct | 14.75×9.83 mm |
| 9.5 ct | 15.02×10.01 mm |
| 10 ct | 15.27×10.18 mm |
| 11 ct | 15.77×10.51 mm |
| 12 ct | 16.23×10.82 mm |
| 13 ct | 16.67×11.11 mm |
| 14 ct | 17.09×11.39 mm |
| 15 ct | 17.48×11.65 mm |
| 16 ct | 17.87×11.91 mm |
| 17 ct | 18.23×12.15 mm |
| 18 ct | 18.57×12.38 mm |
| 19 ct | 18.92×12.61 mm |
| 20 ct | 19.25×12.83 mm |
| 22 ct | 19.86×13.24 mm |
| 24 ct | 20.45×13.63 mm |
| 26 ct | 21×14 mm |
| 28 ct | 21.53×14.35 mm |
| 30 ct | 22.02×14.68 mm |
| 33 ct | 22.74×15.16 mm |
| 36 ct | 23.4×15.6 mm |
| 40 ct | 24.24×16.16 mm |