Cabochon-cut Zircon Size Chart
Carat to mm size chart for cabochon-cut Zircon, 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:
Zircon Size Chart (Cabochon Cut)
0.25ct
4.08×2.72 mm
4.08×2.72 mm
0.5ct
5.15×3.43 mm
5.15×3.43 mm
0.75ct
5.9×3.93 mm
5.9×3.93 mm
1ct
6.48×4.32 mm
6.48×4.32 mm
1.25ct
6.99×4.66 mm
6.99×4.66 mm
1.5ct
7.43×4.95 mm
7.43×4.95 mm
1.75ct
7.82×5.21 mm
7.82×5.21 mm
2ct
8.18×5.45 mm
8.18×5.45 mm
2.5ct
8.81×5.87 mm
8.81×5.87 mm
3ct
9.36×6.24 mm
9.36×6.24 mm
3.5ct
9.84×6.56 mm
9.84×6.56 mm
4ct
10.29×6.86 mm
10.29×6.86 mm
4.5ct
10.71×7.14 mm
10.71×7.14 mm
5ct
11.09×7.39 mm
11.09×7.39 mm
5.5ct
11.45×7.63 mm
11.45×7.63 mm
6ct
11.79×7.86 mm
11.79×7.86 mm
6.5ct
12.11×8.07 mm
12.11×8.07 mm
7ct
12.41×8.27 mm
12.41×8.27 mm
7.5ct
12.69×8.46 mm
12.69×8.46 mm
8ct
12.98×8.65 mm
12.98×8.65 mm
8.5ct
13.23×8.82 mm
13.23×8.82 mm
9ct
13.49×8.99 mm
13.49×8.99 mm
9.5ct
13.74×9.16 mm
13.74×9.16 mm
10ct
13.97×9.31 mm
13.97×9.31 mm
11ct
14.43×9.62 mm
14.43×9.62 mm
12ct
14.85×9.9 mm
14.85×9.9 mm
13ct
15.26×10.17 mm
15.26×10.17 mm
14ct
15.63×10.42 mm
15.63×10.42 mm
15ct
15.99×10.66 mm
15.99×10.66 mm
16ct
16.34×10.89 mm
16.34×10.89 mm
17ct
16.68×11.12 mm
16.68×11.12 mm
18ct
17×11.33 mm
17×11.33 mm
19ct
17.31×11.54 mm
17.31×11.54 mm
20ct
17.61×11.74 mm
17.61×11.74 mm
22ct
18.17×12.11 mm
18.17×12.11 mm
24ct
18.71×12.47 mm
18.71×12.47 mm
26ct
19.22×12.81 mm
19.22×12.81 mm
28ct
19.7×13.13 mm
19.7×13.13 mm
30ct
20.15×13.43 mm
20.15×13.43 mm
33ct
20.81×13.87 mm
20.81×13.87 mm
36ct
21.42×14.28 mm
21.42×14.28 mm
40ct
22.19×14.79 mm
22.19×14.79 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 Zircon carat weights to their approximate millimeter (mm) sizes:
| Carat Weight | MM Size |
|---|---|
| 0.25 ct | 4.08×2.72 mm |
| 0.5 ct | 5.15×3.43 mm |
| 0.75 ct | 5.9×3.93 mm |
| 1 ct | 6.48×4.32 mm |
| 1.25 ct | 6.99×4.66 mm |
| 1.5 ct | 7.43×4.95 mm |
| 1.75 ct | 7.82×5.21 mm |
| 2 ct | 8.18×5.45 mm |
| 2.5 ct | 8.81×5.87 mm |
| 3 ct | 9.36×6.24 mm |
| 3.5 ct | 9.84×6.56 mm |
| 4 ct | 10.29×6.86 mm |
| 4.5 ct | 10.71×7.14 mm |
| 5 ct | 11.09×7.39 mm |
| 5.5 ct | 11.45×7.63 mm |
| 6 ct | 11.79×7.86 mm |
| 6.5 ct | 12.11×8.07 mm |
| 7 ct | 12.41×8.27 mm |
| 7.5 ct | 12.69×8.46 mm |
| 8 ct | 12.98×8.65 mm |
| 8.5 ct | 13.23×8.82 mm |
| Carat Weight | MM Size |
|---|---|
| 9 ct | 13.49×8.99 mm |
| 9.5 ct | 13.74×9.16 mm |
| 10 ct | 13.97×9.31 mm |
| 11 ct | 14.43×9.62 mm |
| 12 ct | 14.85×9.9 mm |
| 13 ct | 15.26×10.17 mm |
| 14 ct | 15.63×10.42 mm |
| 15 ct | 15.99×10.66 mm |
| 16 ct | 16.34×10.89 mm |
| 17 ct | 16.68×11.12 mm |
| 18 ct | 17×11.33 mm |
| 19 ct | 17.31×11.54 mm |
| 20 ct | 17.61×11.74 mm |
| 22 ct | 18.17×12.11 mm |
| 24 ct | 18.71×12.47 mm |
| 26 ct | 19.22×12.81 mm |
| 28 ct | 19.7×13.13 mm |
| 30 ct | 20.15×13.43 mm |
| 33 ct | 20.81×13.87 mm |
| 36 ct | 21.42×14.28 mm |
| 40 ct | 22.19×14.79 mm |