Marquise-cut Tourmaline Size Chart
Carat to mm size chart for marquise-cut Tourmaline, 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:
Tourmaline Size Chart (Marquise Cut)
0.25ct
6.7×3.35 mm
6.7×3.35 mm
0.5ct
8.44×4.22 mm
8.44×4.22 mm
0.75ct
9.66×4.83 mm
9.66×4.83 mm
1ct
10.64×5.32 mm
10.64×5.32 mm
1.25ct
11.46×5.73 mm
11.46×5.73 mm
1.5ct
12.16×6.08 mm
12.16×6.08 mm
1.75ct
12.82×6.41 mm
12.82×6.41 mm
2ct
13.4×6.7 mm
13.4×6.7 mm
2.5ct
14.42×7.21 mm
14.42×7.21 mm
3ct
15.34×7.67 mm
15.34×7.67 mm
3.5ct
16.14×8.07 mm
16.14×8.07 mm
4ct
16.88×8.44 mm
16.88×8.44 mm
4.5ct
17.56×8.78 mm
17.56×8.78 mm
5ct
18.18×9.09 mm
18.18×9.09 mm
5.5ct
18.76×9.38 mm
18.76×9.38 mm
6ct
19.32×9.66 mm
19.32×9.66 mm
6.5ct
19.84×9.92 mm
19.84×9.92 mm
7ct
20.34×10.17 mm
20.34×10.17 mm
7.5ct
20.8×10.4 mm
20.8×10.4 mm
8ct
21.26×10.63 mm
21.26×10.63 mm
8.5ct
21.7×10.85 mm
21.7×10.85 mm
9ct
22.12×11.06 mm
22.12×11.06 mm
9.5ct
22.52×11.26 mm
22.52×11.26 mm
10ct
22.9×11.45 mm
22.9×11.45 mm
11ct
23.64×11.82 mm
23.64×11.82 mm
12ct
24.34×12.17 mm
24.34×12.17 mm
13ct
25×12.5 mm
25×12.5 mm
14ct
25.62×12.81 mm
25.62×12.81 mm
15ct
26.22×13.11 mm
26.22×13.11 mm
16ct
26.78×13.39 mm
26.78×13.39 mm
17ct
27.34×13.67 mm
27.34×13.67 mm
18ct
27.86×13.93 mm
27.86×13.93 mm
19ct
28.36×14.18 mm
28.36×14.18 mm
20ct
28.86×14.43 mm
28.86×14.43 mm
22ct
29.78×14.89 mm
29.78×14.89 mm
24ct
30.66×15.33 mm
30.66×15.33 mm
26ct
31.5×15.75 mm
31.5×15.75 mm
28ct
32.28×16.14 mm
32.28×16.14 mm
30ct
33.04×16.52 mm
33.04×16.52 mm
33ct
34.1×17.05 mm
34.1×17.05 mm
36ct
35.1×17.55 mm
35.1×17.55 mm
40ct
36.36×18.18 mm
36.36×18.18 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 Tourmaline carat weights to their approximate millimeter (mm) sizes:
| Carat Weight | MM Size |
|---|---|
| 0.25 ct | 6.7×3.35 mm |
| 0.5 ct | 8.44×4.22 mm |
| 0.75 ct | 9.66×4.83 mm |
| 1 ct | 10.64×5.32 mm |
| 1.25 ct | 11.46×5.73 mm |
| 1.5 ct | 12.16×6.08 mm |
| 1.75 ct | 12.82×6.41 mm |
| 2 ct | 13.4×6.7 mm |
| 2.5 ct | 14.42×7.21 mm |
| 3 ct | 15.34×7.67 mm |
| 3.5 ct | 16.14×8.07 mm |
| 4 ct | 16.88×8.44 mm |
| 4.5 ct | 17.56×8.78 mm |
| 5 ct | 18.18×9.09 mm |
| 5.5 ct | 18.76×9.38 mm |
| 6 ct | 19.32×9.66 mm |
| 6.5 ct | 19.84×9.92 mm |
| 7 ct | 20.34×10.17 mm |
| 7.5 ct | 20.8×10.4 mm |
| 8 ct | 21.26×10.63 mm |
| 8.5 ct | 21.7×10.85 mm |
| Carat Weight | MM Size |
|---|---|
| 9 ct | 22.12×11.06 mm |
| 9.5 ct | 22.52×11.26 mm |
| 10 ct | 22.9×11.45 mm |
| 11 ct | 23.64×11.82 mm |
| 12 ct | 24.34×12.17 mm |
| 13 ct | 25×12.5 mm |
| 14 ct | 25.62×12.81 mm |
| 15 ct | 26.22×13.11 mm |
| 16 ct | 26.78×13.39 mm |
| 17 ct | 27.34×13.67 mm |
| 18 ct | 27.86×13.93 mm |
| 19 ct | 28.36×14.18 mm |
| 20 ct | 28.86×14.43 mm |
| 22 ct | 29.78×14.89 mm |
| 24 ct | 30.66×15.33 mm |
| 26 ct | 31.5×15.75 mm |
| 28 ct | 32.28×16.14 mm |
| 30 ct | 33.04×16.52 mm |
| 33 ct | 34.1×17.05 mm |
| 36 ct | 35.1×17.55 mm |
| 40 ct | 36.36×18.18 mm |