Oval-cut Sapphire Size Chart
Carat to mm size chart for oval-cut Sapphire, 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:
Sapphire Size Chart (Oval Cut)
0.25ct
4.83×3.22 mm
4.83×3.22 mm
0.5ct
6.09×4.06 mm
6.09×4.06 mm
0.75ct
6.96×4.64 mm
6.96×4.64 mm
1ct
7.67×5.11 mm
7.67×5.11 mm
1.25ct
8.27×5.51 mm
8.27×5.51 mm
1.5ct
8.78×5.85 mm
8.78×5.85 mm
1.75ct
9.24×6.16 mm
9.24×6.16 mm
2ct
9.66×6.44 mm
9.66×6.44 mm
2.5ct
10.41×6.94 mm
10.41×6.94 mm
3ct
11.06×7.37 mm
11.06×7.37 mm
3.5ct
11.64×7.76 mm
11.64×7.76 mm
4ct
12.17×8.11 mm
12.17×8.11 mm
4.5ct
12.66×8.44 mm
12.66×8.44 mm
5ct
13.11×8.74 mm
13.11×8.74 mm
5.5ct
13.53×9.02 mm
13.53×9.02 mm
6ct
13.94×9.29 mm
13.94×9.29 mm
6.5ct
14.31×9.54 mm
14.31×9.54 mm
7ct
14.67×9.78 mm
14.67×9.78 mm
7.5ct
15.02×10.01 mm
15.02×10.01 mm
8ct
15.33×10.22 mm
15.33×10.22 mm
8.5ct
15.65×10.43 mm
15.65×10.43 mm
9ct
15.95×10.63 mm
15.95×10.63 mm
9.5ct
16.25×10.83 mm
16.25×10.83 mm
10ct
16.52×11.01 mm
16.52×11.01 mm
11ct
17.06×11.37 mm
17.06×11.37 mm
12ct
17.55×11.7 mm
17.55×11.7 mm
13ct
18.03×12.02 mm
18.03×12.02 mm
14ct
18.48×12.32 mm
18.48×12.32 mm
15ct
18.92×12.61 mm
18.92×12.61 mm
16ct
19.32×12.88 mm
19.32×12.88 mm
17ct
19.71×13.14 mm
19.71×13.14 mm
18ct
20.1×13.4 mm
20.1×13.4 mm
19ct
20.46×13.64 mm
20.46×13.64 mm
20ct
20.81×13.87 mm
20.81×13.87 mm
22ct
21.48×14.32 mm
21.48×14.32 mm
24ct
22.11×14.74 mm
22.11×14.74 mm
26ct
22.71×15.14 mm
22.71×15.14 mm
28ct
23.28×15.52 mm
23.28×15.52 mm
30ct
23.82×15.88 mm
23.82×15.88 mm
33ct
24.6×16.4 mm
24.6×16.4 mm
36ct
25.32×16.88 mm
25.32×16.88 mm
40ct
26.22×17.48 mm
26.22×17.48 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 Sapphire carat weights to their approximate millimeter (mm) sizes:
| Carat Weight | MM Size |
|---|---|
| 0.25 ct | 4.83×3.22 mm |
| 0.5 ct | 6.09×4.06 mm |
| 0.75 ct | 6.96×4.64 mm |
| 1 ct | 7.67×5.11 mm |
| 1.25 ct | 8.27×5.51 mm |
| 1.5 ct | 8.78×5.85 mm |
| 1.75 ct | 9.24×6.16 mm |
| 2 ct | 9.66×6.44 mm |
| 2.5 ct | 10.41×6.94 mm |
| 3 ct | 11.06×7.37 mm |
| 3.5 ct | 11.64×7.76 mm |
| 4 ct | 12.17×8.11 mm |
| 4.5 ct | 12.66×8.44 mm |
| 5 ct | 13.11×8.74 mm |
| 5.5 ct | 13.53×9.02 mm |
| 6 ct | 13.94×9.29 mm |
| 6.5 ct | 14.31×9.54 mm |
| 7 ct | 14.67×9.78 mm |
| 7.5 ct | 15.02×10.01 mm |
| 8 ct | 15.33×10.22 mm |
| 8.5 ct | 15.65×10.43 mm |
| Carat Weight | MM Size |
|---|---|
| 9 ct | 15.95×10.63 mm |
| 9.5 ct | 16.25×10.83 mm |
| 10 ct | 16.52×11.01 mm |
| 11 ct | 17.06×11.37 mm |
| 12 ct | 17.55×11.7 mm |
| 13 ct | 18.03×12.02 mm |
| 14 ct | 18.48×12.32 mm |
| 15 ct | 18.92×12.61 mm |
| 16 ct | 19.32×12.88 mm |
| 17 ct | 19.71×13.14 mm |
| 18 ct | 20.1×13.4 mm |
| 19 ct | 20.46×13.64 mm |
| 20 ct | 20.81×13.87 mm |
| 22 ct | 21.48×14.32 mm |
| 24 ct | 22.11×14.74 mm |
| 26 ct | 22.71×15.14 mm |
| 28 ct | 23.28×15.52 mm |
| 30 ct | 23.82×15.88 mm |
| 33 ct | 24.6×16.4 mm |
| 36 ct | 25.32×16.88 mm |
| 40 ct | 26.22×17.48 mm |