Marquise-cut Tanzanite Size Chart
Carat to mm size chart for marquise-cut Tanzanite, 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:
Tanzanite Size Chart (Marquise Cut)
0.25ct
6.5×3.25 mm
6.5×3.25 mm
0.5ct
8.18×4.09 mm
8.18×4.09 mm
0.75ct
9.38×4.69 mm
9.38×4.69 mm
1ct
10.32×5.16 mm
10.32×5.16 mm
1.25ct
11.12×5.56 mm
11.12×5.56 mm
1.5ct
11.8×5.9 mm
11.8×5.9 mm
1.75ct
12.44×6.22 mm
12.44×6.22 mm
2ct
13×6.5 mm
13×6.5 mm
2.5ct
14×7 mm
14×7 mm
3ct
14.88×7.44 mm
14.88×7.44 mm
3.5ct
15.66×7.83 mm
15.66×7.83 mm
4ct
16.38×8.19 mm
16.38×8.19 mm
4.5ct
17.02×8.51 mm
17.02×8.51 mm
5ct
17.64×8.82 mm
17.64×8.82 mm
5.5ct
18.2×9.1 mm
18.2×9.1 mm
6ct
18.74×9.37 mm
18.74×9.37 mm
6.5ct
19.26×9.63 mm
19.26×9.63 mm
7ct
19.74×9.87 mm
19.74×9.87 mm
7.5ct
20.2×10.1 mm
20.2×10.1 mm
8ct
20.62×10.31 mm
20.62×10.31 mm
8.5ct
21.06×10.53 mm
21.06×10.53 mm
9ct
21.46×10.73 mm
21.46×10.73 mm
9.5ct
21.84×10.92 mm
21.84×10.92 mm
10ct
22.22×11.11 mm
22.22×11.11 mm
11ct
22.94×11.47 mm
22.94×11.47 mm
12ct
23.62×11.81 mm
23.62×11.81 mm
13ct
24.26×12.13 mm
24.26×12.13 mm
14ct
24.86×12.43 mm
24.86×12.43 mm
15ct
25.44×12.72 mm
25.44×12.72 mm
16ct
26×13 mm
26×13 mm
17ct
26.52×13.26 mm
26.52×13.26 mm
18ct
27.04×13.52 mm
27.04×13.52 mm
19ct
27.52×13.76 mm
27.52×13.76 mm
20ct
28×14 mm
28×14 mm
22ct
28.9×14.45 mm
28.9×14.45 mm
24ct
29.76×14.88 mm
29.76×14.88 mm
26ct
30.56×15.28 mm
30.56×15.28 mm
28ct
31.32×15.66 mm
31.32×15.66 mm
30ct
32.06×16.03 mm
32.06×16.03 mm
33ct
33.08×16.54 mm
33.08×16.54 mm
36ct
34.06×17.03 mm
34.06×17.03 mm
40ct
35.28×17.64 mm
35.28×17.64 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 Tanzanite carat weights to their approximate millimeter (mm) sizes:
| Carat Weight | MM Size |
|---|---|
| 0.25 ct | 6.5×3.25 mm |
| 0.5 ct | 8.18×4.09 mm |
| 0.75 ct | 9.38×4.69 mm |
| 1 ct | 10.32×5.16 mm |
| 1.25 ct | 11.12×5.56 mm |
| 1.5 ct | 11.8×5.9 mm |
| 1.75 ct | 12.44×6.22 mm |
| 2 ct | 13×6.5 mm |
| 2.5 ct | 14×7 mm |
| 3 ct | 14.88×7.44 mm |
| 3.5 ct | 15.66×7.83 mm |
| 4 ct | 16.38×8.19 mm |
| 4.5 ct | 17.02×8.51 mm |
| 5 ct | 17.64×8.82 mm |
| 5.5 ct | 18.2×9.1 mm |
| 6 ct | 18.74×9.37 mm |
| 6.5 ct | 19.26×9.63 mm |
| 7 ct | 19.74×9.87 mm |
| 7.5 ct | 20.2×10.1 mm |
| 8 ct | 20.62×10.31 mm |
| 8.5 ct | 21.06×10.53 mm |
| Carat Weight | MM Size |
|---|---|
| 9 ct | 21.46×10.73 mm |
| 9.5 ct | 21.84×10.92 mm |
| 10 ct | 22.22×11.11 mm |
| 11 ct | 22.94×11.47 mm |
| 12 ct | 23.62×11.81 mm |
| 13 ct | 24.26×12.13 mm |
| 14 ct | 24.86×12.43 mm |
| 15 ct | 25.44×12.72 mm |
| 16 ct | 26×13 mm |
| 17 ct | 26.52×13.26 mm |
| 18 ct | 27.04×13.52 mm |
| 19 ct | 27.52×13.76 mm |
| 20 ct | 28×14 mm |
| 22 ct | 28.9×14.45 mm |
| 24 ct | 29.76×14.88 mm |
| 26 ct | 30.56×15.28 mm |
| 28 ct | 31.32×15.66 mm |
| 30 ct | 32.06×16.03 mm |
| 33 ct | 33.08×16.54 mm |
| 36 ct | 34.06×17.03 mm |
| 40 ct | 35.28×17.64 mm |