Marquise-cut Alexandrite Size Chart
Carat to mm size chart for marquise-cut Alexandrite, 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:
Alexandrite Size Chart (Marquise Cut)
0.25ct
6.26×3.13 mm
6.26×3.13 mm
0.5ct
7.9×3.95 mm
7.9×3.95 mm
0.75ct
9.04×4.52 mm
9.04×4.52 mm
1ct
9.96×4.98 mm
9.96×4.98 mm
1.25ct
10.72×5.36 mm
10.72×5.36 mm
1.5ct
11.4×5.7 mm
11.4×5.7 mm
1.75ct
12×6 mm
12×6 mm
2ct
12.54×6.27 mm
12.54×6.27 mm
2.5ct
13.5×6.75 mm
13.5×6.75 mm
3ct
14.36×7.18 mm
14.36×7.18 mm
3.5ct
15.1×7.55 mm
15.1×7.55 mm
4ct
15.8×7.9 mm
15.8×7.9 mm
4.5ct
16.44×8.22 mm
16.44×8.22 mm
5ct
17.02×8.51 mm
17.02×8.51 mm
5.5ct
17.56×8.78 mm
17.56×8.78 mm
6ct
18.08×9.04 mm
18.08×9.04 mm
6.5ct
18.58×9.29 mm
18.58×9.29 mm
7ct
19.04×9.52 mm
19.04×9.52 mm
7.5ct
19.48×9.74 mm
19.48×9.74 mm
8ct
19.9×9.95 mm
19.9×9.95 mm
8.5ct
20.32×10.16 mm
20.32×10.16 mm
9ct
20.7×10.35 mm
20.7×10.35 mm
9.5ct
21.08×10.54 mm
21.08×10.54 mm
10ct
21.44×10.72 mm
21.44×10.72 mm
11ct
22.14×11.07 mm
22.14×11.07 mm
12ct
22.78×11.39 mm
22.78×11.39 mm
13ct
23.4×11.7 mm
23.4×11.7 mm
14ct
23.98×11.99 mm
23.98×11.99 mm
15ct
24.54×12.27 mm
24.54×12.27 mm
16ct
25.08×12.54 mm
25.08×12.54 mm
17ct
25.58×12.79 mm
25.58×12.79 mm
18ct
26.08×13.04 mm
26.08×13.04 mm
19ct
26.56×13.28 mm
26.56×13.28 mm
20ct
27.02×13.51 mm
27.02×13.51 mm
22ct
27.88×13.94 mm
27.88×13.94 mm
24ct
28.7×14.35 mm
28.7×14.35 mm
26ct
29.48×14.74 mm
29.48×14.74 mm
28ct
30.22×15.11 mm
30.22×15.11 mm
30ct
30.92×15.46 mm
30.92×15.46 mm
33ct
31.92×15.96 mm
31.92×15.96 mm
36ct
32.86×16.43 mm
32.86×16.43 mm
40ct
34.04×17.02 mm
34.04×17.02 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 Alexandrite carat weights to their approximate millimeter (mm) sizes:
| Carat Weight | MM Size |
|---|---|
| 0.25 ct | 6.26×3.13 mm |
| 0.5 ct | 7.9×3.95 mm |
| 0.75 ct | 9.04×4.52 mm |
| 1 ct | 9.96×4.98 mm |
| 1.25 ct | 10.72×5.36 mm |
| 1.5 ct | 11.4×5.7 mm |
| 1.75 ct | 12×6 mm |
| 2 ct | 12.54×6.27 mm |
| 2.5 ct | 13.5×6.75 mm |
| 3 ct | 14.36×7.18 mm |
| 3.5 ct | 15.1×7.55 mm |
| 4 ct | 15.8×7.9 mm |
| 4.5 ct | 16.44×8.22 mm |
| 5 ct | 17.02×8.51 mm |
| 5.5 ct | 17.56×8.78 mm |
| 6 ct | 18.08×9.04 mm |
| 6.5 ct | 18.58×9.29 mm |
| 7 ct | 19.04×9.52 mm |
| 7.5 ct | 19.48×9.74 mm |
| 8 ct | 19.9×9.95 mm |
| 8.5 ct | 20.32×10.16 mm |
| Carat Weight | MM Size |
|---|---|
| 9 ct | 20.7×10.35 mm |
| 9.5 ct | 21.08×10.54 mm |
| 10 ct | 21.44×10.72 mm |
| 11 ct | 22.14×11.07 mm |
| 12 ct | 22.78×11.39 mm |
| 13 ct | 23.4×11.7 mm |
| 14 ct | 23.98×11.99 mm |
| 15 ct | 24.54×12.27 mm |
| 16 ct | 25.08×12.54 mm |
| 17 ct | 25.58×12.79 mm |
| 18 ct | 26.08×13.04 mm |
| 19 ct | 26.56×13.28 mm |
| 20 ct | 27.02×13.51 mm |
| 22 ct | 27.88×13.94 mm |
| 24 ct | 28.7×14.35 mm |
| 26 ct | 29.48×14.74 mm |
| 28 ct | 30.22×15.11 mm |
| 30 ct | 30.92×15.46 mm |
| 33 ct | 31.92×15.96 mm |
| 36 ct | 32.86×16.43 mm |
| 40 ct | 34.04×17.02 mm |