Oval-cut Diamond Size Chart
Carat to mm size chart for oval-cut Diamond, 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:
Diamond Size Chart (Oval Cut)
0.25ct
5.12×3.41 mm
5.12×3.41 mm
0.5ct
6.44×4.29 mm
6.44×4.29 mm
0.75ct
7.38×4.92 mm
7.38×4.92 mm
1ct
8.12×5.41 mm
8.12×5.41 mm
1.25ct
8.75×5.83 mm
8.75×5.83 mm
1.5ct
9.29×6.19 mm
9.29×6.19 mm
1.75ct
9.78×6.52 mm
9.78×6.52 mm
2ct
10.23×6.82 mm
10.23×6.82 mm
2.5ct
11.01×7.34 mm
11.01×7.34 mm
3ct
11.7×7.8 mm
11.7×7.8 mm
3.5ct
12.32×8.21 mm
12.32×8.21 mm
4ct
12.89×8.59 mm
12.89×8.59 mm
4.5ct
13.4×8.93 mm
13.4×8.93 mm
5ct
13.88×9.25 mm
13.88×9.25 mm
5.5ct
14.33×9.55 mm
14.33×9.55 mm
6ct
14.75×9.83 mm
14.75×9.83 mm
6.5ct
15.15×10.1 mm
15.15×10.1 mm
7ct
15.53×10.35 mm
15.53×10.35 mm
7.5ct
15.89×10.59 mm
15.89×10.59 mm
8ct
16.23×10.82 mm
16.23×10.82 mm
8.5ct
16.56×11.04 mm
16.56×11.04 mm
9ct
16.88×11.25 mm
16.88×11.25 mm
9.5ct
17.19×11.46 mm
17.19×11.46 mm
10ct
17.49×11.66 mm
17.49×11.66 mm
11ct
18.05×12.03 mm
18.05×12.03 mm
12ct
18.59×12.39 mm
18.59×12.39 mm
13ct
19.08×12.72 mm
19.08×12.72 mm
14ct
19.56×13.04 mm
19.56×13.04 mm
15ct
20.01×13.34 mm
20.01×13.34 mm
16ct
20.45×13.63 mm
20.45×13.63 mm
17ct
20.87×13.91 mm
20.87×13.91 mm
18ct
21.27×14.18 mm
21.27×14.18 mm
19ct
21.66×14.44 mm
21.66×14.44 mm
20ct
22.04×14.69 mm
22.04×14.69 mm
22ct
22.74×15.16 mm
22.74×15.16 mm
24ct
23.42×15.61 mm
23.42×15.61 mm
26ct
24.05×16.03 mm
24.05×16.03 mm
28ct
24.65×16.43 mm
24.65×16.43 mm
30ct
25.22×16.81 mm
25.22×16.81 mm
33ct
26.03×17.35 mm
26.03×17.35 mm
36ct
26.81×17.87 mm
26.81×17.87 mm
40ct
27.75×18.5 mm
27.75×18.5 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 Diamond carat weights to their approximate millimeter (mm) sizes:
| Carat Weight | MM Size |
|---|---|
| 0.25 ct | 5.12×3.41 mm |
| 0.5 ct | 6.44×4.29 mm |
| 0.75 ct | 7.38×4.92 mm |
| 1 ct | 8.12×5.41 mm |
| 1.25 ct | 8.75×5.83 mm |
| 1.5 ct | 9.29×6.19 mm |
| 1.75 ct | 9.78×6.52 mm |
| 2 ct | 10.23×6.82 mm |
| 2.5 ct | 11.01×7.34 mm |
| 3 ct | 11.7×7.8 mm |
| 3.5 ct | 12.32×8.21 mm |
| 4 ct | 12.89×8.59 mm |
| 4.5 ct | 13.4×8.93 mm |
| 5 ct | 13.88×9.25 mm |
| 5.5 ct | 14.33×9.55 mm |
| 6 ct | 14.75×9.83 mm |
| 6.5 ct | 15.15×10.1 mm |
| 7 ct | 15.53×10.35 mm |
| 7.5 ct | 15.89×10.59 mm |
| 8 ct | 16.23×10.82 mm |
| 8.5 ct | 16.56×11.04 mm |
| Carat Weight | MM Size |
|---|---|
| 9 ct | 16.88×11.25 mm |
| 9.5 ct | 17.19×11.46 mm |
| 10 ct | 17.49×11.66 mm |
| 11 ct | 18.05×12.03 mm |
| 12 ct | 18.59×12.39 mm |
| 13 ct | 19.08×12.72 mm |
| 14 ct | 19.56×13.04 mm |
| 15 ct | 20.01×13.34 mm |
| 16 ct | 20.45×13.63 mm |
| 17 ct | 20.87×13.91 mm |
| 18 ct | 21.27×14.18 mm |
| 19 ct | 21.66×14.44 mm |
| 20 ct | 22.04×14.69 mm |
| 22 ct | 22.74×15.16 mm |
| 24 ct | 23.42×15.61 mm |
| 26 ct | 24.05×16.03 mm |
| 28 ct | 24.65×16.43 mm |
| 30 ct | 25.22×16.81 mm |
| 33 ct | 26.03×17.35 mm |
| 36 ct | 26.81×17.87 mm |
| 40 ct | 27.75×18.5 mm |