Cabochon-cut Alexandrite Size Chart
Carat to mm size chart for cabochon-cut Alexandrite, 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:
Alexandrite Size Chart (Cabochon Cut)
0.25ct
4.41×2.94 mm
4.41×2.94 mm
0.5ct
5.57×3.71 mm
5.57×3.71 mm
0.75ct
6.36×4.24 mm
6.36×4.24 mm
1ct
7.01×4.67 mm
7.01×4.67 mm
1.25ct
7.55×5.03 mm
7.55×5.03 mm
1.5ct
8.03×5.35 mm
8.03×5.35 mm
1.75ct
8.45×5.63 mm
8.45×5.63 mm
2ct
8.82×5.88 mm
8.82×5.88 mm
2.5ct
9.51×6.34 mm
9.51×6.34 mm
3ct
10.11×6.74 mm
10.11×6.74 mm
3.5ct
10.64×7.09 mm
10.64×7.09 mm
4ct
11.12×7.41 mm
11.12×7.41 mm
4.5ct
11.57×7.71 mm
11.57×7.71 mm
5ct
11.99×7.99 mm
11.99×7.99 mm
5.5ct
12.36×8.24 mm
12.36×8.24 mm
6ct
12.74×8.49 mm
12.74×8.49 mm
6.5ct
13.08×8.72 mm
13.08×8.72 mm
7ct
13.4×8.93 mm
13.4×8.93 mm
7.5ct
13.71×9.14 mm
13.71×9.14 mm
8ct
14.01×9.34 mm
14.01×9.34 mm
8.5ct
14.3×9.53 mm
14.3×9.53 mm
9ct
14.57×9.71 mm
14.57×9.71 mm
9.5ct
14.84×9.89 mm
14.84×9.89 mm
10ct
15.09×10.06 mm
15.09×10.06 mm
11ct
15.59×10.39 mm
15.59×10.39 mm
12ct
16.04×10.69 mm
16.04×10.69 mm
13ct
16.47×10.98 mm
16.47×10.98 mm
14ct
16.89×11.26 mm
16.89×11.26 mm
15ct
17.28×11.52 mm
17.28×11.52 mm
16ct
17.66×11.77 mm
17.66×11.77 mm
17ct
18.02×12.01 mm
18.02×12.01 mm
18ct
18.36×12.24 mm
18.36×12.24 mm
19ct
18.69×12.46 mm
18.69×12.46 mm
20ct
19.02×12.68 mm
19.02×12.68 mm
22ct
19.64×13.09 mm
19.64×13.09 mm
24ct
20.21×13.47 mm
20.21×13.47 mm
26ct
20.75×13.83 mm
20.75×13.83 mm
28ct
21.27×14.18 mm
21.27×14.18 mm
30ct
21.77×14.51 mm
21.77×14.51 mm
33ct
22.47×14.98 mm
22.47×14.98 mm
36ct
23.13×15.42 mm
23.13×15.42 mm
40ct
23.96×15.97 mm
23.96×15.97 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 Alexandrite carat weights to their approximate millimeter (mm) sizes:
| Carat Weight | MM Size |
|---|---|
| 0.25 ct | 4.41×2.94 mm |
| 0.5 ct | 5.57×3.71 mm |
| 0.75 ct | 6.36×4.24 mm |
| 1 ct | 7.01×4.67 mm |
| 1.25 ct | 7.55×5.03 mm |
| 1.5 ct | 8.03×5.35 mm |
| 1.75 ct | 8.45×5.63 mm |
| 2 ct | 8.82×5.88 mm |
| 2.5 ct | 9.51×6.34 mm |
| 3 ct | 10.11×6.74 mm |
| 3.5 ct | 10.64×7.09 mm |
| 4 ct | 11.12×7.41 mm |
| 4.5 ct | 11.57×7.71 mm |
| 5 ct | 11.99×7.99 mm |
| 5.5 ct | 12.36×8.24 mm |
| 6 ct | 12.74×8.49 mm |
| 6.5 ct | 13.08×8.72 mm |
| 7 ct | 13.4×8.93 mm |
| 7.5 ct | 13.71×9.14 mm |
| 8 ct | 14.01×9.34 mm |
| 8.5 ct | 14.3×9.53 mm |
| Carat Weight | MM Size |
|---|---|
| 9 ct | 14.57×9.71 mm |
| 9.5 ct | 14.84×9.89 mm |
| 10 ct | 15.09×10.06 mm |
| 11 ct | 15.59×10.39 mm |
| 12 ct | 16.04×10.69 mm |
| 13 ct | 16.47×10.98 mm |
| 14 ct | 16.89×11.26 mm |
| 15 ct | 17.28×11.52 mm |
| 16 ct | 17.66×11.77 mm |
| 17 ct | 18.02×12.01 mm |
| 18 ct | 18.36×12.24 mm |
| 19 ct | 18.69×12.46 mm |
| 20 ct | 19.02×12.68 mm |
| 22 ct | 19.64×13.09 mm |
| 24 ct | 20.21×13.47 mm |
| 26 ct | 20.75×13.83 mm |
| 28 ct | 21.27×14.18 mm |
| 30 ct | 21.77×14.51 mm |
| 33 ct | 22.47×14.98 mm |
| 36 ct | 23.13×15.42 mm |
| 40 ct | 23.96×15.97 mm |