Marquise-cut Diamond Size Chart
Carat to mm size chart for marquise-cut Diamond, from 0.25ct to 40ct (at an L/W ratio of 2). 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 (Marquise Cut)
0.25ct
6.54×3.27 mm
6.54×3.27 mm
0.5ct
8.24×4.12 mm
8.24×4.12 mm
0.75ct
9.44×4.72 mm
9.44×4.72 mm
1ct
10.38×5.19 mm
10.38×5.19 mm
1.25ct
11.18×5.59 mm
11.18×5.59 mm
1.5ct
11.9×5.95 mm
11.9×5.95 mm
1.75ct
12.52×6.26 mm
12.52×6.26 mm
2ct
13.08×6.54 mm
13.08×6.54 mm
2.5ct
14.1×7.05 mm
14.1×7.05 mm
3ct
14.98×7.49 mm
14.98×7.49 mm
3.5ct
15.78×7.89 mm
15.78×7.89 mm
4ct
16.48×8.24 mm
16.48×8.24 mm
4.5ct
17.14×8.57 mm
17.14×8.57 mm
5ct
17.76×8.88 mm
17.76×8.88 mm
5.5ct
18.34×9.17 mm
18.34×9.17 mm
6ct
18.88×9.44 mm
18.88×9.44 mm
6.5ct
19.38×9.69 mm
19.38×9.69 mm
7ct
19.88×9.94 mm
19.88×9.94 mm
7.5ct
20.34×10.17 mm
20.34×10.17 mm
8ct
20.78×10.39 mm
20.78×10.39 mm
8.5ct
21.2×10.6 mm
21.2×10.6 mm
9ct
21.6×10.8 mm
21.6×10.8 mm
9.5ct
22×11 mm
22×11 mm
10ct
22.38×11.19 mm
22.38×11.19 mm
11ct
23.1×11.55 mm
23.1×11.55 mm
12ct
23.78×11.89 mm
23.78×11.89 mm
13ct
24.42×12.21 mm
24.42×12.21 mm
14ct
25.04×12.52 mm
25.04×12.52 mm
15ct
25.62×12.81 mm
25.62×12.81 mm
16ct
26.18×13.09 mm
26.18×13.09 mm
17ct
26.72×13.36 mm
26.72×13.36 mm
18ct
27.22×13.61 mm
27.22×13.61 mm
19ct
27.72×13.86 mm
27.72×13.86 mm
20ct
28.2×14.1 mm
28.2×14.1 mm
22ct
29.1×14.55 mm
29.1×14.55 mm
24ct
29.96×14.98 mm
29.96×14.98 mm
26ct
30.78×15.39 mm
30.78×15.39 mm
28ct
31.54×15.77 mm
31.54×15.77 mm
30ct
32.28×16.14 mm
32.28×16.14 mm
33ct
33.32×16.66 mm
33.32×16.66 mm
36ct
34.3×17.15 mm
34.3×17.15 mm
40ct
35.52×17.76 mm
35.52×17.76 mm
Length-to-width ratio: 2, 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 marquise-cut Diamond carat weights to their approximate millimeter (mm) sizes:
| Carat Weight | MM Size |
|---|---|
| 0.25 ct | 6.54×3.27 mm |
| 0.5 ct | 8.24×4.12 mm |
| 0.75 ct | 9.44×4.72 mm |
| 1 ct | 10.38×5.19 mm |
| 1.25 ct | 11.18×5.59 mm |
| 1.5 ct | 11.9×5.95 mm |
| 1.75 ct | 12.52×6.26 mm |
| 2 ct | 13.08×6.54 mm |
| 2.5 ct | 14.1×7.05 mm |
| 3 ct | 14.98×7.49 mm |
| 3.5 ct | 15.78×7.89 mm |
| 4 ct | 16.48×8.24 mm |
| 4.5 ct | 17.14×8.57 mm |
| 5 ct | 17.76×8.88 mm |
| 5.5 ct | 18.34×9.17 mm |
| 6 ct | 18.88×9.44 mm |
| 6.5 ct | 19.38×9.69 mm |
| 7 ct | 19.88×9.94 mm |
| 7.5 ct | 20.34×10.17 mm |
| 8 ct | 20.78×10.39 mm |
| 8.5 ct | 21.2×10.6 mm |
| Carat Weight | MM Size |
|---|---|
| 9 ct | 21.6×10.8 mm |
| 9.5 ct | 22×11 mm |
| 10 ct | 22.38×11.19 mm |
| 11 ct | 23.1×11.55 mm |
| 12 ct | 23.78×11.89 mm |
| 13 ct | 24.42×12.21 mm |
| 14 ct | 25.04×12.52 mm |
| 15 ct | 25.62×12.81 mm |
| 16 ct | 26.18×13.09 mm |
| 17 ct | 26.72×13.36 mm |
| 18 ct | 27.22×13.61 mm |
| 19 ct | 27.72×13.86 mm |
| 20 ct | 28.2×14.1 mm |
| 22 ct | 29.1×14.55 mm |
| 24 ct | 29.96×14.98 mm |
| 26 ct | 30.78×15.39 mm |
| 28 ct | 31.54×15.77 mm |
| 30 ct | 32.28×16.14 mm |
| 33 ct | 33.32×16.66 mm |
| 36 ct | 34.3×17.15 mm |
| 40 ct | 35.52×17.76 mm |