Oval-cut Tanzanite Size Chart
Carat to mm size chart for oval-cut Tanzanite, 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:
Tanzanite Size Chart (Oval Cut)
0.25ct
5.13×3.42 mm
5.13×3.42 mm
0.5ct
6.45×4.3 mm
6.45×4.3 mm
0.75ct
7.4×4.93 mm
7.4×4.93 mm
1ct
8.13×5.42 mm
8.13×5.42 mm
1.25ct
8.76×5.84 mm
8.76×5.84 mm
1.5ct
9.32×6.21 mm
9.32×6.21 mm
1.75ct
9.8×6.53 mm
9.8×6.53 mm
2ct
10.25×6.83 mm
10.25×6.83 mm
2.5ct
11.04×7.36 mm
11.04×7.36 mm
3ct
11.73×7.82 mm
11.73×7.82 mm
3.5ct
12.35×8.23 mm
12.35×8.23 mm
4ct
12.92×8.61 mm
12.92×8.61 mm
4.5ct
13.43×8.95 mm
13.43×8.95 mm
5ct
13.91×9.27 mm
13.91×9.27 mm
5.5ct
14.36×9.57 mm
14.36×9.57 mm
6ct
14.78×9.85 mm
14.78×9.85 mm
6.5ct
15.18×10.12 mm
15.18×10.12 mm
7ct
15.56×10.37 mm
15.56×10.37 mm
7.5ct
15.92×10.61 mm
15.92×10.61 mm
8ct
16.28×10.85 mm
16.28×10.85 mm
8.5ct
16.61×11.07 mm
16.61×11.07 mm
9ct
16.92×11.28 mm
16.92×11.28 mm
9.5ct
17.22×11.48 mm
17.22×11.48 mm
10ct
17.52×11.68 mm
17.52×11.68 mm
11ct
18.09×12.06 mm
18.09×12.06 mm
12ct
18.62×12.41 mm
18.62×12.41 mm
13ct
19.13×12.75 mm
19.13×12.75 mm
14ct
19.61×13.07 mm
19.61×13.07 mm
15ct
20.06×13.37 mm
20.06×13.37 mm
16ct
20.49×13.66 mm
20.49×13.66 mm
17ct
20.91×13.94 mm
20.91×13.94 mm
18ct
21.32×14.21 mm
21.32×14.21 mm
19ct
21.71×14.47 mm
21.71×14.47 mm
20ct
22.08×14.72 mm
22.08×14.72 mm
22ct
22.79×15.19 mm
22.79×15.19 mm
24ct
23.46×15.64 mm
23.46×15.64 mm
26ct
24.09×16.06 mm
24.09×16.06 mm
28ct
24.71×16.47 mm
24.71×16.47 mm
30ct
25.28×16.85 mm
25.28×16.85 mm
33ct
26.09×17.39 mm
26.09×17.39 mm
36ct
26.87×17.91 mm
26.87×17.91 mm
40ct
27.83×18.55 mm
27.83×18.55 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 oval-cut Tanzanite carat weights to their approximate millimeter (mm) sizes:
| Carat Weight | MM Size |
|---|---|
| 0.25 ct | 5.13×3.42 mm |
| 0.5 ct | 6.45×4.3 mm |
| 0.75 ct | 7.4×4.93 mm |
| 1 ct | 8.13×5.42 mm |
| 1.25 ct | 8.76×5.84 mm |
| 1.5 ct | 9.32×6.21 mm |
| 1.75 ct | 9.8×6.53 mm |
| 2 ct | 10.25×6.83 mm |
| 2.5 ct | 11.04×7.36 mm |
| 3 ct | 11.73×7.82 mm |
| 3.5 ct | 12.35×8.23 mm |
| 4 ct | 12.92×8.61 mm |
| 4.5 ct | 13.43×8.95 mm |
| 5 ct | 13.91×9.27 mm |
| 5.5 ct | 14.36×9.57 mm |
| 6 ct | 14.78×9.85 mm |
| 6.5 ct | 15.18×10.12 mm |
| 7 ct | 15.56×10.37 mm |
| 7.5 ct | 15.92×10.61 mm |
| 8 ct | 16.28×10.85 mm |
| 8.5 ct | 16.61×11.07 mm |
| Carat Weight | MM Size |
|---|---|
| 9 ct | 16.92×11.28 mm |
| 9.5 ct | 17.22×11.48 mm |
| 10 ct | 17.52×11.68 mm |
| 11 ct | 18.09×12.06 mm |
| 12 ct | 18.62×12.41 mm |
| 13 ct | 19.13×12.75 mm |
| 14 ct | 19.61×13.07 mm |
| 15 ct | 20.06×13.37 mm |
| 16 ct | 20.49×13.66 mm |
| 17 ct | 20.91×13.94 mm |
| 18 ct | 21.32×14.21 mm |
| 19 ct | 21.71×14.47 mm |
| 20 ct | 22.08×14.72 mm |
| 22 ct | 22.79×15.19 mm |
| 24 ct | 23.46×15.64 mm |
| 26 ct | 24.09×16.06 mm |
| 28 ct | 24.71×16.47 mm |
| 30 ct | 25.28×16.85 mm |
| 33 ct | 26.09×17.39 mm |
| 36 ct | 26.87×17.91 mm |
| 40 ct | 27.83×18.55 mm |