Cabochon-cut Cubic Zirconia Size Chart
Carat to mm size chart for cabochon-cut Cubic Zirconia, 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:
Cubic Zirconia Size Chart (Cabochon Cut)
0.25ct
3.84×2.56 mm
3.84×2.56 mm
0.5ct
4.85×3.23 mm
4.85×3.23 mm
0.75ct
5.54×3.69 mm
5.54×3.69 mm
1ct
6.11×4.07 mm
6.11×4.07 mm
1.25ct
6.57×4.38 mm
6.57×4.38 mm
1.5ct
6.98×4.65 mm
6.98×4.65 mm
1.75ct
7.35×4.9 mm
7.35×4.9 mm
2ct
7.68×5.12 mm
7.68×5.12 mm
2.5ct
8.28×5.52 mm
8.28×5.52 mm
3ct
8.79×5.86 mm
8.79×5.86 mm
3.5ct
9.26×6.17 mm
9.26×6.17 mm
4ct
9.68×6.45 mm
9.68×6.45 mm
4.5ct
10.07×6.71 mm
10.07×6.71 mm
5ct
10.43×6.95 mm
10.43×6.95 mm
5.5ct
10.77×7.18 mm
10.77×7.18 mm
6ct
11.09×7.39 mm
11.09×7.39 mm
6.5ct
11.39×7.59 mm
11.39×7.59 mm
7ct
11.67×7.78 mm
11.67×7.78 mm
7.5ct
11.94×7.96 mm
11.94×7.96 mm
8ct
12.2×8.13 mm
12.2×8.13 mm
8.5ct
12.45×8.3 mm
12.45×8.3 mm
9ct
12.69×8.46 mm
12.69×8.46 mm
9.5ct
12.92×8.61 mm
12.92×8.61 mm
10ct
13.14×8.76 mm
13.14×8.76 mm
11ct
13.56×9.04 mm
13.56×9.04 mm
12ct
13.97×9.31 mm
13.97×9.31 mm
13ct
14.34×9.56 mm
14.34×9.56 mm
14ct
14.7×9.8 mm
14.7×9.8 mm
15ct
15.05×10.03 mm
15.05×10.03 mm
16ct
15.38×10.25 mm
15.38×10.25 mm
17ct
15.69×10.46 mm
15.69×10.46 mm
18ct
15.99×10.66 mm
15.99×10.66 mm
19ct
16.28×10.85 mm
16.28×10.85 mm
20ct
16.56×11.04 mm
16.56×11.04 mm
22ct
17.09×11.39 mm
17.09×11.39 mm
24ct
17.6×11.73 mm
17.6×11.73 mm
26ct
18.08×12.05 mm
18.08×12.05 mm
28ct
18.53×12.35 mm
18.53×12.35 mm
30ct
18.95×12.63 mm
18.95×12.63 mm
33ct
19.56×13.04 mm
19.56×13.04 mm
36ct
20.15×13.43 mm
20.15×13.43 mm
40ct
20.87×13.91 mm
20.87×13.91 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 Cubic Zirconia carat weights to their approximate millimeter (mm) sizes:
| Carat Weight | MM Size |
|---|---|
| 0.25 ct | 3.84×2.56 mm |
| 0.5 ct | 4.85×3.23 mm |
| 0.75 ct | 5.54×3.69 mm |
| 1 ct | 6.11×4.07 mm |
| 1.25 ct | 6.57×4.38 mm |
| 1.5 ct | 6.98×4.65 mm |
| 1.75 ct | 7.35×4.9 mm |
| 2 ct | 7.68×5.12 mm |
| 2.5 ct | 8.28×5.52 mm |
| 3 ct | 8.79×5.86 mm |
| 3.5 ct | 9.26×6.17 mm |
| 4 ct | 9.68×6.45 mm |
| 4.5 ct | 10.07×6.71 mm |
| 5 ct | 10.43×6.95 mm |
| 5.5 ct | 10.77×7.18 mm |
| 6 ct | 11.09×7.39 mm |
| 6.5 ct | 11.39×7.59 mm |
| 7 ct | 11.67×7.78 mm |
| 7.5 ct | 11.94×7.96 mm |
| 8 ct | 12.2×8.13 mm |
| 8.5 ct | 12.45×8.3 mm |
| Carat Weight | MM Size |
|---|---|
| 9 ct | 12.69×8.46 mm |
| 9.5 ct | 12.92×8.61 mm |
| 10 ct | 13.14×8.76 mm |
| 11 ct | 13.56×9.04 mm |
| 12 ct | 13.97×9.31 mm |
| 13 ct | 14.34×9.56 mm |
| 14 ct | 14.7×9.8 mm |
| 15 ct | 15.05×10.03 mm |
| 16 ct | 15.38×10.25 mm |
| 17 ct | 15.69×10.46 mm |
| 18 ct | 15.99×10.66 mm |
| 19 ct | 16.28×10.85 mm |
| 20 ct | 16.56×11.04 mm |
| 22 ct | 17.09×11.39 mm |
| 24 ct | 17.6×11.73 mm |
| 26 ct | 18.08×12.05 mm |
| 28 ct | 18.53×12.35 mm |
| 30 ct | 18.95×12.63 mm |
| 33 ct | 19.56×13.04 mm |
| 36 ct | 20.15×13.43 mm |
| 40 ct | 20.87×13.91 mm |