Cabochon-cut Topaz Size Chart
Carat to mm size chart for cabochon-cut Topaz, 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:
Topaz Size Chart (Cabochon Cut)
0.25ct
4.5×3 mm
4.5×3 mm
0.5ct
5.67×3.78 mm
5.67×3.78 mm
0.75ct
6.48×4.32 mm
6.48×4.32 mm
1ct
7.14×4.76 mm
7.14×4.76 mm
1.25ct
7.68×5.12 mm
7.68×5.12 mm
1.5ct
8.16×5.44 mm
8.16×5.44 mm
1.75ct
8.6×5.73 mm
8.6×5.73 mm
2ct
8.99×5.99 mm
8.99×5.99 mm
2.5ct
9.69×6.46 mm
9.69×6.46 mm
3ct
10.29×6.86 mm
10.29×6.86 mm
3.5ct
10.83×7.22 mm
10.83×7.22 mm
4ct
11.33×7.55 mm
11.33×7.55 mm
4.5ct
11.78×7.85 mm
11.78×7.85 mm
5ct
12.2×8.13 mm
12.2×8.13 mm
5.5ct
12.6×8.4 mm
12.6×8.4 mm
6ct
12.96×8.64 mm
12.96×8.64 mm
6.5ct
13.32×8.88 mm
13.32×8.88 mm
7ct
13.65×9.1 mm
13.65×9.1 mm
7.5ct
13.97×9.31 mm
13.97×9.31 mm
8ct
14.27×9.51 mm
14.27×9.51 mm
8.5ct
14.57×9.71 mm
14.57×9.71 mm
9ct
14.84×9.89 mm
14.84×9.89 mm
9.5ct
15.11×10.07 mm
15.11×10.07 mm
10ct
15.38×10.25 mm
15.38×10.25 mm
11ct
15.87×10.58 mm
15.87×10.58 mm
12ct
16.34×10.89 mm
16.34×10.89 mm
13ct
16.77×11.18 mm
16.77×11.18 mm
14ct
17.19×11.46 mm
17.19×11.46 mm
15ct
17.6×11.73 mm
17.6×11.73 mm
16ct
17.99×11.99 mm
17.99×11.99 mm
17ct
18.35×12.23 mm
18.35×12.23 mm
18ct
18.71×12.47 mm
18.71×12.47 mm
19ct
19.04×12.69 mm
19.04×12.69 mm
20ct
19.37×12.91 mm
19.37×12.91 mm
22ct
20×13.33 mm
20×13.33 mm
24ct
20.58×13.72 mm
20.58×13.72 mm
26ct
21.14×14.09 mm
21.14×14.09 mm
28ct
21.66×14.44 mm
21.66×14.44 mm
30ct
22.17×14.78 mm
22.17×14.78 mm
33ct
22.89×15.26 mm
22.89×15.26 mm
36ct
23.57×15.71 mm
23.57×15.71 mm
40ct
24.41×16.27 mm
24.41×16.27 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 cabochon-cut Topaz carat weights to their approximate millimeter (mm) sizes:
| Carat Weight | MM Size |
|---|---|
| 0.25 ct | 4.5×3 mm |
| 0.5 ct | 5.67×3.78 mm |
| 0.75 ct | 6.48×4.32 mm |
| 1 ct | 7.14×4.76 mm |
| 1.25 ct | 7.68×5.12 mm |
| 1.5 ct | 8.16×5.44 mm |
| 1.75 ct | 8.6×5.73 mm |
| 2 ct | 8.99×5.99 mm |
| 2.5 ct | 9.69×6.46 mm |
| 3 ct | 10.29×6.86 mm |
| 3.5 ct | 10.83×7.22 mm |
| 4 ct | 11.33×7.55 mm |
| 4.5 ct | 11.78×7.85 mm |
| 5 ct | 12.2×8.13 mm |
| 5.5 ct | 12.6×8.4 mm |
| 6 ct | 12.96×8.64 mm |
| 6.5 ct | 13.32×8.88 mm |
| 7 ct | 13.65×9.1 mm |
| 7.5 ct | 13.97×9.31 mm |
| 8 ct | 14.27×9.51 mm |
| 8.5 ct | 14.57×9.71 mm |
| Carat Weight | MM Size |
|---|---|
| 9 ct | 14.84×9.89 mm |
| 9.5 ct | 15.11×10.07 mm |
| 10 ct | 15.38×10.25 mm |
| 11 ct | 15.87×10.58 mm |
| 12 ct | 16.34×10.89 mm |
| 13 ct | 16.77×11.18 mm |
| 14 ct | 17.19×11.46 mm |
| 15 ct | 17.6×11.73 mm |
| 16 ct | 17.99×11.99 mm |
| 17 ct | 18.35×12.23 mm |
| 18 ct | 18.71×12.47 mm |
| 19 ct | 19.04×12.69 mm |
| 20 ct | 19.37×12.91 mm |
| 22 ct | 20×13.33 mm |
| 24 ct | 20.58×13.72 mm |
| 26 ct | 21.14×14.09 mm |
| 28 ct | 21.66×14.44 mm |
| 30 ct | 22.17×14.78 mm |
| 33 ct | 22.89×15.26 mm |
| 36 ct | 23.57×15.71 mm |
| 40 ct | 24.41×16.27 mm |