Aquamarine Size Chart (Round)
Carat to mm size chart for round-cut Aquamarine, 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:
Aquamarine Size Chart (Round Cut)
0.25ct
4.28×4.28 mm
4.28×4.28 mm
0.5ct
5.4×5.4 mm
5.4×5.4 mm
0.75ct
6.18×6.18 mm
6.18×6.18 mm
1ct
6.8×6.8 mm
6.8×6.8 mm
1.25ct
7.32×7.32 mm
7.32×7.32 mm
1.5ct
7.78×7.78 mm
7.78×7.78 mm
1.75ct
8.19×8.19 mm
8.19×8.19 mm
2ct
8.57×8.57 mm
8.57×8.57 mm
2.5ct
9.23×9.23 mm
9.23×9.23 mm
3ct
9.81×9.81 mm
9.81×9.81 mm
3.5ct
10.32×10.32 mm
10.32×10.32 mm
4ct
10.79×10.79 mm
10.79×10.79 mm
4.5ct
11.22×11.22 mm
11.22×11.22 mm
5ct
11.63×11.63 mm
11.63×11.63 mm
5.5ct
12×12 mm
12×12 mm
6ct
12.35×12.35 mm
12.35×12.35 mm
6.5ct
12.69×12.69 mm
12.69×12.69 mm
7ct
13.01×13.01 mm
13.01×13.01 mm
7.5ct
13.31×13.31 mm
13.31×13.31 mm
8ct
13.6×13.6 mm
13.6×13.6 mm
8.5ct
13.87×13.87 mm
13.87×13.87 mm
9ct
14.14×14.14 mm
14.14×14.14 mm
9.5ct
14.4×14.4 mm
14.4×14.4 mm
10ct
14.65×14.65 mm
14.65×14.65 mm
11ct
15.12×15.12 mm
15.12×15.12 mm
12ct
15.56×15.56 mm
15.56×15.56 mm
13ct
15.99×15.99 mm
15.99×15.99 mm
14ct
16.39×16.39 mm
16.39×16.39 mm
15ct
16.77×16.77 mm
16.77×16.77 mm
16ct
17.13×17.13 mm
17.13×17.13 mm
17ct
17.48×17.48 mm
17.48×17.48 mm
18ct
17.82×17.82 mm
17.82×17.82 mm
19ct
18.14×18.14 mm
18.14×18.14 mm
20ct
18.45×18.45 mm
18.45×18.45 mm
22ct
19.05×19.05 mm
19.05×19.05 mm
24ct
19.61×19.61 mm
19.61×19.61 mm
26ct
20.14×20.14 mm
20.14×20.14 mm
28ct
20.64×20.64 mm
20.64×20.64 mm
30ct
21.12×21.12 mm
21.12×21.12 mm
33ct
21.81×21.81 mm
21.81×21.81 mm
36ct
22.45×22.45 mm
22.45×22.45 mm
40ct
23.25×23.25 mm
23.25×23.25 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 Aquamarine carat weights to their approximate millimeter (mm) sizes:
| Carat Weight | MM Size |
|---|---|
| 0.25 ct | 4.28×4.28 mm |
| 0.5 ct | 5.4×5.4 mm |
| 0.75 ct | 6.18×6.18 mm |
| 1 ct | 6.8×6.8 mm |
| 1.25 ct | 7.32×7.32 mm |
| 1.5 ct | 7.78×7.78 mm |
| 1.75 ct | 8.19×8.19 mm |
| 2 ct | 8.57×8.57 mm |
| 2.5 ct | 9.23×9.23 mm |
| 3 ct | 9.81×9.81 mm |
| 3.5 ct | 10.32×10.32 mm |
| 4 ct | 10.79×10.79 mm |
| 4.5 ct | 11.22×11.22 mm |
| 5 ct | 11.63×11.63 mm |
| 5.5 ct | 12×12 mm |
| 6 ct | 12.35×12.35 mm |
| 6.5 ct | 12.69×12.69 mm |
| 7 ct | 13.01×13.01 mm |
| 7.5 ct | 13.31×13.31 mm |
| 8 ct | 13.6×13.6 mm |
| 8.5 ct | 13.87×13.87 mm |
| Carat Weight | MM Size |
|---|---|
| 9 ct | 14.14×14.14 mm |
| 9.5 ct | 14.4×14.4 mm |
| 10 ct | 14.65×14.65 mm |
| 11 ct | 15.12×15.12 mm |
| 12 ct | 15.56×15.56 mm |
| 13 ct | 15.99×15.99 mm |
| 14 ct | 16.39×16.39 mm |
| 15 ct | 16.77×16.77 mm |
| 16 ct | 17.13×17.13 mm |
| 17 ct | 17.48×17.48 mm |
| 18 ct | 17.82×17.82 mm |
| 19 ct | 18.14×18.14 mm |
| 20 ct | 18.45×18.45 mm |
| 22 ct | 19.05×19.05 mm |
| 24 ct | 19.61×19.61 mm |
| 26 ct | 20.14×20.14 mm |
| 28 ct | 20.64×20.64 mm |
| 30 ct | 21.12×21.12 mm |
| 33 ct | 21.81×21.81 mm |
| 36 ct | 22.45×22.45 mm |
| 40 ct | 23.25×23.25 mm |