Oval-cut Diaspore Size Chart
Carat to mm size chart for oval-cut Diaspore, 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:
Diaspore Size Chart (Oval Cut)
0.25ct
5.1×3.4 mm
5.1×3.4 mm
0.5ct
6.42×4.28 mm
6.42×4.28 mm
0.75ct
7.35×4.9 mm
7.35×4.9 mm
1ct
8.1×5.4 mm
8.1×5.4 mm
1.25ct
8.72×5.81 mm
8.72×5.81 mm
1.5ct
9.27×6.18 mm
9.27×6.18 mm
1.75ct
9.75×6.5 mm
9.75×6.5 mm
2ct
10.2×6.8 mm
10.2×6.8 mm
2.5ct
10.98×7.32 mm
10.98×7.32 mm
3ct
11.67×7.78 mm
11.67×7.78 mm
3.5ct
12.29×8.19 mm
12.29×8.19 mm
4ct
12.86×8.57 mm
12.86×8.57 mm
4.5ct
13.37×8.91 mm
13.37×8.91 mm
5ct
13.85×9.23 mm
13.85×9.23 mm
5.5ct
14.28×9.52 mm
14.28×9.52 mm
6ct
14.72×9.81 mm
14.72×9.81 mm
6.5ct
15.11×10.07 mm
15.11×10.07 mm
7ct
15.48×10.32 mm
15.48×10.32 mm
7.5ct
15.84×10.56 mm
15.84×10.56 mm
8ct
16.19×10.79 mm
16.19×10.79 mm
8.5ct
16.52×11.01 mm
16.52×11.01 mm
9ct
16.83×11.22 mm
16.83×11.22 mm
9.5ct
17.15×11.43 mm
17.15×11.43 mm
10ct
17.45×11.63 mm
17.45×11.63 mm
11ct
18×12 mm
18×12 mm
12ct
18.53×12.35 mm
18.53×12.35 mm
13ct
19.04×12.69 mm
19.04×12.69 mm
14ct
19.52×13.01 mm
19.52×13.01 mm
15ct
19.97×13.31 mm
19.97×13.31 mm
16ct
20.4×13.6 mm
20.4×13.6 mm
17ct
20.81×13.87 mm
20.81×13.87 mm
18ct
21.21×14.14 mm
21.21×14.14 mm
19ct
21.6×14.4 mm
21.6×14.4 mm
20ct
21.98×14.65 mm
21.98×14.65 mm
22ct
22.68×15.12 mm
22.68×15.12 mm
24ct
23.34×15.56 mm
23.34×15.56 mm
26ct
23.99×15.99 mm
23.99×15.99 mm
28ct
24.59×16.39 mm
24.59×16.39 mm
30ct
25.16×16.77 mm
25.16×16.77 mm
33ct
25.97×17.31 mm
25.97×17.31 mm
36ct
26.73×17.82 mm
26.73×17.82 mm
40ct
27.68×18.45 mm
27.68×18.45 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 Diaspore carat weights to their approximate millimeter (mm) sizes:
| Carat Weight | MM Size |
|---|---|
| 0.25 ct | 5.1×3.4 mm |
| 0.5 ct | 6.42×4.28 mm |
| 0.75 ct | 7.35×4.9 mm |
| 1 ct | 8.1×5.4 mm |
| 1.25 ct | 8.72×5.81 mm |
| 1.5 ct | 9.27×6.18 mm |
| 1.75 ct | 9.75×6.5 mm |
| 2 ct | 10.2×6.8 mm |
| 2.5 ct | 10.98×7.32 mm |
| 3 ct | 11.67×7.78 mm |
| 3.5 ct | 12.29×8.19 mm |
| 4 ct | 12.86×8.57 mm |
| 4.5 ct | 13.37×8.91 mm |
| 5 ct | 13.85×9.23 mm |
| 5.5 ct | 14.28×9.52 mm |
| 6 ct | 14.72×9.81 mm |
| 6.5 ct | 15.11×10.07 mm |
| 7 ct | 15.48×10.32 mm |
| 7.5 ct | 15.84×10.56 mm |
| 8 ct | 16.19×10.79 mm |
| 8.5 ct | 16.52×11.01 mm |
| Carat Weight | MM Size |
|---|---|
| 9 ct | 16.83×11.22 mm |
| 9.5 ct | 17.15×11.43 mm |
| 10 ct | 17.45×11.63 mm |
| 11 ct | 18×12 mm |
| 12 ct | 18.53×12.35 mm |
| 13 ct | 19.04×12.69 mm |
| 14 ct | 19.52×13.01 mm |
| 15 ct | 19.97×13.31 mm |
| 16 ct | 20.4×13.6 mm |
| 17 ct | 20.81×13.87 mm |
| 18 ct | 21.21×14.14 mm |
| 19 ct | 21.6×14.4 mm |
| 20 ct | 21.98×14.65 mm |
| 22 ct | 22.68×15.12 mm |
| 24 ct | 23.34×15.56 mm |
| 26 ct | 23.99×15.99 mm |
| 28 ct | 24.59×16.39 mm |
| 30 ct | 25.16×16.77 mm |
| 33 ct | 25.97×17.31 mm |
| 36 ct | 26.73×17.82 mm |
| 40 ct | 27.68×18.45 mm |