Zircon Size Chart (Round)
Carat to mm size chart for round-cut Zircon, from 0.25ct to 40ct. 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 (Round Cut)
0.25ct
3.57×3.57 mm
3.57×3.57 mm
0.5ct
4.5×4.5 mm
4.5×4.5 mm
0.75ct
5.15×5.15 mm
5.15×5.15 mm
1ct
5.67×5.67 mm
5.67×5.67 mm
1.25ct
6.1×6.1 mm
6.1×6.1 mm
1.5ct
6.49×6.49 mm
6.49×6.49 mm
1.75ct
6.83×6.83 mm
6.83×6.83 mm
2ct
7.14×7.14 mm
7.14×7.14 mm
2.5ct
7.69×7.69 mm
7.69×7.69 mm
3ct
8.17×8.17 mm
8.17×8.17 mm
3.5ct
8.6×8.6 mm
8.6×8.6 mm
4ct
8.99×8.99 mm
8.99×8.99 mm
4.5ct
9.35×9.35 mm
9.35×9.35 mm
5ct
9.69×9.69 mm
9.69×9.69 mm
5.5ct
10×10 mm
10×10 mm
6ct
10.29×10.29 mm
10.29×10.29 mm
6.5ct
10.57×10.57 mm
10.57×10.57 mm
7ct
10.84×10.84 mm
10.84×10.84 mm
7.5ct
11.09×11.09 mm
11.09×11.09 mm
8ct
11.33×11.33 mm
11.33×11.33 mm
8.5ct
11.56×11.56 mm
11.56×11.56 mm
9ct
11.78×11.78 mm
11.78×11.78 mm
9.5ct
12×12 mm
12×12 mm
10ct
12.21×12.21 mm
12.21×12.21 mm
11ct
12.6×12.6 mm
12.6×12.6 mm
12ct
12.97×12.97 mm
12.97×12.97 mm
13ct
13.32×13.32 mm
13.32×13.32 mm
14ct
13.65×13.65 mm
13.65×13.65 mm
15ct
13.97×13.97 mm
13.97×13.97 mm
16ct
14.28×14.28 mm
14.28×14.28 mm
17ct
14.57×14.57 mm
14.57×14.57 mm
18ct
14.85×14.85 mm
14.85×14.85 mm
19ct
15.12×15.12 mm
15.12×15.12 mm
20ct
15.38×15.38 mm
15.38×15.38 mm
22ct
15.87×15.87 mm
15.87×15.87 mm
24ct
16.34×16.34 mm
16.34×16.34 mm
26ct
16.78×16.78 mm
16.78×16.78 mm
28ct
17.2×17.2 mm
17.2×17.2 mm
30ct
17.6×17.6 mm
17.6×17.6 mm
33ct
18.17×18.17 mm
18.17×18.17 mm
36ct
18.71×18.71 mm
18.71×18.71 mm
40ct
19.38×19.38 mm
19.38×19.38 mm
Length-to-width ratio: 1, 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 round-cut Zircon carat weights to their approximate millimeter (mm) sizes:
| Carat Weight | MM Size |
|---|---|
| 0.25 ct | 3.57×3.57 mm |
| 0.5 ct | 4.5×4.5 mm |
| 0.75 ct | 5.15×5.15 mm |
| 1 ct | 5.67×5.67 mm |
| 1.25 ct | 6.1×6.1 mm |
| 1.5 ct | 6.49×6.49 mm |
| 1.75 ct | 6.83×6.83 mm |
| 2 ct | 7.14×7.14 mm |
| 2.5 ct | 7.69×7.69 mm |
| 3 ct | 8.17×8.17 mm |
| 3.5 ct | 8.6×8.6 mm |
| 4 ct | 8.99×8.99 mm |
| 4.5 ct | 9.35×9.35 mm |
| 5 ct | 9.69×9.69 mm |
| 5.5 ct | 10×10 mm |
| 6 ct | 10.29×10.29 mm |
| 6.5 ct | 10.57×10.57 mm |
| 7 ct | 10.84×10.84 mm |
| 7.5 ct | 11.09×11.09 mm |
| 8 ct | 11.33×11.33 mm |
| 8.5 ct | 11.56×11.56 mm |
| Carat Weight | MM Size |
|---|---|
| 9 ct | 11.78×11.78 mm |
| 9.5 ct | 12×12 mm |
| 10 ct | 12.21×12.21 mm |
| 11 ct | 12.6×12.6 mm |
| 12 ct | 12.97×12.97 mm |
| 13 ct | 13.32×13.32 mm |
| 14 ct | 13.65×13.65 mm |
| 15 ct | 13.97×13.97 mm |
| 16 ct | 14.28×14.28 mm |
| 17 ct | 14.57×14.57 mm |
| 18 ct | 14.85×14.85 mm |
| 19 ct | 15.12×15.12 mm |
| 20 ct | 15.38×15.38 mm |
| 22 ct | 15.87×15.87 mm |
| 24 ct | 16.34×16.34 mm |
| 26 ct | 16.78×16.78 mm |
| 28 ct | 17.2×17.2 mm |
| 30 ct | 17.6×17.6 mm |
| 33 ct | 18.17×18.17 mm |
| 36 ct | 18.71×18.71 mm |
| 40 ct | 19.38×19.38 mm |