Oval-cut Tourmaline Size Chart
Carat to mm size chart for oval-cut Tourmaline, 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:
Tourmaline Size Chart (Oval Cut)
0.25ct
5.28×3.52 mm
5.28×3.52 mm
0.5ct
6.66×4.44 mm
6.66×4.44 mm
0.75ct
7.62×5.08 mm
7.62×5.08 mm
1ct
8.39×5.59 mm
8.39×5.59 mm
1.25ct
9.03×6.02 mm
9.03×6.02 mm
1.5ct
9.6×6.4 mm
9.6×6.4 mm
1.75ct
10.1×6.73 mm
10.1×6.73 mm
2ct
10.56×7.04 mm
10.56×7.04 mm
2.5ct
11.39×7.59 mm
11.39×7.59 mm
3ct
12.09×8.06 mm
12.09×8.06 mm
3.5ct
12.74×8.49 mm
12.74×8.49 mm
4ct
13.31×8.87 mm
13.31×8.87 mm
4.5ct
13.85×9.23 mm
13.85×9.23 mm
5ct
14.34×9.56 mm
14.34×9.56 mm
5.5ct
14.81×9.87 mm
14.81×9.87 mm
6ct
15.24×10.16 mm
15.24×10.16 mm
6.5ct
15.65×10.43 mm
15.65×10.43 mm
7ct
16.04×10.69 mm
16.04×10.69 mm
7.5ct
16.41×10.94 mm
16.41×10.94 mm
8ct
16.77×11.18 mm
16.77×11.18 mm
8.5ct
17.12×11.41 mm
17.12×11.41 mm
9ct
17.45×11.63 mm
17.45×11.63 mm
9.5ct
17.76×11.84 mm
17.76×11.84 mm
10ct
18.06×12.04 mm
18.06×12.04 mm
11ct
18.65×12.43 mm
18.65×12.43 mm
12ct
19.2×12.8 mm
19.2×12.8 mm
13ct
19.71×13.14 mm
19.71×13.14 mm
14ct
20.21×13.47 mm
20.21×13.47 mm
15ct
20.67×13.78 mm
20.67×13.78 mm
16ct
21.12×14.08 mm
21.12×14.08 mm
17ct
21.56×14.37 mm
21.56×14.37 mm
18ct
21.98×14.65 mm
21.98×14.65 mm
19ct
22.37×14.91 mm
22.37×14.91 mm
20ct
22.76×15.17 mm
22.76×15.17 mm
22ct
23.49×15.66 mm
23.49×15.66 mm
24ct
24.18×16.12 mm
24.18×16.12 mm
26ct
24.84×16.56 mm
24.84×16.56 mm
28ct
25.46×16.97 mm
25.46×16.97 mm
30ct
26.06×17.37 mm
26.06×17.37 mm
33ct
26.9×17.93 mm
26.9×17.93 mm
36ct
27.68×18.45 mm
27.68×18.45 mm
40ct
28.67×19.11 mm
28.67×19.11 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 Tourmaline carat weights to their approximate millimeter (mm) sizes:
| Carat Weight | MM Size |
|---|---|
| 0.25 ct | 5.28×3.52 mm |
| 0.5 ct | 6.66×4.44 mm |
| 0.75 ct | 7.62×5.08 mm |
| 1 ct | 8.39×5.59 mm |
| 1.25 ct | 9.03×6.02 mm |
| 1.5 ct | 9.6×6.4 mm |
| 1.75 ct | 10.1×6.73 mm |
| 2 ct | 10.56×7.04 mm |
| 2.5 ct | 11.39×7.59 mm |
| 3 ct | 12.09×8.06 mm |
| 3.5 ct | 12.74×8.49 mm |
| 4 ct | 13.31×8.87 mm |
| 4.5 ct | 13.85×9.23 mm |
| 5 ct | 14.34×9.56 mm |
| 5.5 ct | 14.81×9.87 mm |
| 6 ct | 15.24×10.16 mm |
| 6.5 ct | 15.65×10.43 mm |
| 7 ct | 16.04×10.69 mm |
| 7.5 ct | 16.41×10.94 mm |
| 8 ct | 16.77×11.18 mm |
| 8.5 ct | 17.12×11.41 mm |
| Carat Weight | MM Size |
|---|---|
| 9 ct | 17.45×11.63 mm |
| 9.5 ct | 17.76×11.84 mm |
| 10 ct | 18.06×12.04 mm |
| 11 ct | 18.65×12.43 mm |
| 12 ct | 19.2×12.8 mm |
| 13 ct | 19.71×13.14 mm |
| 14 ct | 20.21×13.47 mm |
| 15 ct | 20.67×13.78 mm |
| 16 ct | 21.12×14.08 mm |
| 17 ct | 21.56×14.37 mm |
| 18 ct | 21.98×14.65 mm |
| 19 ct | 22.37×14.91 mm |
| 20 ct | 22.76×15.17 mm |
| 22 ct | 23.49×15.66 mm |
| 24 ct | 24.18×16.12 mm |
| 26 ct | 24.84×16.56 mm |
| 28 ct | 25.46×16.97 mm |
| 30 ct | 26.06×17.37 mm |
| 33 ct | 26.9×17.93 mm |
| 36 ct | 27.68×18.45 mm |
| 40 ct | 28.67×19.11 mm |