Emerald-cut Ruby Size Chart
Carat to mm size chart for emerald-cut Ruby, from 0.25ct to 40ct (at an L/W ratio of 1.35). 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:
Ruby Size Chart (Emerald Cut)
0.25ct
4.02×2.98 mm
4.02×2.98 mm
0.5ct
5.06×3.75 mm
5.06×3.75 mm
0.75ct
5.81×4.3 mm
5.81×4.3 mm
1ct
6.39×4.73 mm
6.39×4.73 mm
1.25ct
6.89×5.1 mm
6.89×5.1 mm
1.5ct
7.3×5.41 mm
7.3×5.41 mm
1.75ct
7.7×5.7 mm
7.7×5.7 mm
2ct
8.05×5.96 mm
8.05×5.96 mm
2.5ct
8.67×6.42 mm
8.67×6.42 mm
3ct
9.21×6.82 mm
9.21×6.82 mm
3.5ct
9.69×7.18 mm
9.69×7.18 mm
4ct
10.14×7.51 mm
10.14×7.51 mm
4.5ct
10.54×7.81 mm
10.54×7.81 mm
5ct
10.92×8.09 mm
10.92×8.09 mm
5.5ct
11.27×8.35 mm
11.27×8.35 mm
6ct
11.6×8.59 mm
11.6×8.59 mm
6.5ct
11.92×8.83 mm
11.92×8.83 mm
7ct
12.22×9.05 mm
12.22×9.05 mm
7.5ct
12.5×9.26 mm
12.5×9.26 mm
8ct
12.77×9.46 mm
12.77×9.46 mm
8.5ct
13.03×9.65 mm
13.03×9.65 mm
9ct
13.28×9.84 mm
13.28×9.84 mm
9.5ct
13.53×10.02 mm
13.53×10.02 mm
10ct
13.76×10.19 mm
13.76×10.19 mm
11ct
14.2×10.52 mm
14.2×10.52 mm
12ct
14.62×10.83 mm
14.62×10.83 mm
13ct
15.01×11.12 mm
15.01×11.12 mm
14ct
15.39×11.4 mm
15.39×11.4 mm
15ct
15.75×11.67 mm
15.75×11.67 mm
16ct
16.09×11.92 mm
16.09×11.92 mm
17ct
16.42×12.16 mm
16.42×12.16 mm
18ct
16.74×12.4 mm
16.74×12.4 mm
19ct
17.04×12.62 mm
17.04×12.62 mm
20ct
17.33×12.84 mm
17.33×12.84 mm
22ct
17.89×13.25 mm
17.89×13.25 mm
24ct
18.41×13.64 mm
18.41×13.64 mm
26ct
18.91×14.01 mm
18.91×14.01 mm
28ct
19.39×14.36 mm
19.39×14.36 mm
30ct
19.85×14.7 mm
19.85×14.7 mm
33ct
20.48×15.17 mm
20.48×15.17 mm
36ct
21.09×15.62 mm
21.09×15.62 mm
40ct
21.84×16.18 mm
21.84×16.18 mm
Length-to-width ratio: 1.35, 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 emerald-cut Ruby carat weights to their approximate millimeter (mm) sizes:
| Carat Weight | MM Size |
|---|---|
| 0.25 ct | 4.02×2.98 mm |
| 0.5 ct | 5.06×3.75 mm |
| 0.75 ct | 5.81×4.3 mm |
| 1 ct | 6.39×4.73 mm |
| 1.25 ct | 6.89×5.1 mm |
| 1.5 ct | 7.3×5.41 mm |
| 1.75 ct | 7.7×5.7 mm |
| 2 ct | 8.05×5.96 mm |
| 2.5 ct | 8.67×6.42 mm |
| 3 ct | 9.21×6.82 mm |
| 3.5 ct | 9.69×7.18 mm |
| 4 ct | 10.14×7.51 mm |
| 4.5 ct | 10.54×7.81 mm |
| 5 ct | 10.92×8.09 mm |
| 5.5 ct | 11.27×8.35 mm |
| 6 ct | 11.6×8.59 mm |
| 6.5 ct | 11.92×8.83 mm |
| 7 ct | 12.22×9.05 mm |
| 7.5 ct | 12.5×9.26 mm |
| 8 ct | 12.77×9.46 mm |
| 8.5 ct | 13.03×9.65 mm |
| Carat Weight | MM Size |
|---|---|
| 9 ct | 13.28×9.84 mm |
| 9.5 ct | 13.53×10.02 mm |
| 10 ct | 13.76×10.19 mm |
| 11 ct | 14.2×10.52 mm |
| 12 ct | 14.62×10.83 mm |
| 13 ct | 15.01×11.12 mm |
| 14 ct | 15.39×11.4 mm |
| 15 ct | 15.75×11.67 mm |
| 16 ct | 16.09×11.92 mm |
| 17 ct | 16.42×12.16 mm |
| 18 ct | 16.74×12.4 mm |
| 19 ct | 17.04×12.62 mm |
| 20 ct | 17.33×12.84 mm |
| 22 ct | 17.89×13.25 mm |
| 24 ct | 18.41×13.64 mm |
| 26 ct | 18.91×14.01 mm |
| 28 ct | 19.39×14.36 mm |
| 30 ct | 19.85×14.7 mm |
| 33 ct | 20.48×15.17 mm |
| 36 ct | 21.09×15.62 mm |
| 40 ct | 21.84×16.18 mm |