Pear-cut Ruby Size Chart
Carat to mm size chart for pear-cut Ruby, from 0.25ct to 40ct (at an L/W ratio of 1.66). 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 (Pear Cut)
0.25ct
5.36×3.23 mm
5.36×3.23 mm
0.5ct
6.76×4.07 mm
6.76×4.07 mm
0.75ct
7.72×4.65 mm
7.72×4.65 mm
1ct
8.5×5.12 mm
8.5×5.12 mm
1.25ct
9.16×5.52 mm
9.16×5.52 mm
1.5ct
9.73×5.86 mm
9.73×5.86 mm
1.75ct
10.24×6.17 mm
10.24×6.17 mm
2ct
10.71×6.45 mm
10.71×6.45 mm
2.5ct
11.54×6.95 mm
11.54×6.95 mm
3ct
12.27×7.39 mm
12.27×7.39 mm
3.5ct
12.91×7.78 mm
12.91×7.78 mm
4ct
13.5×8.13 mm
13.5×8.13 mm
4.5ct
14.04×8.46 mm
14.04×8.46 mm
5ct
14.54×8.76 mm
14.54×8.76 mm
5.5ct
15.01×9.04 mm
15.01×9.04 mm
6ct
15.45×9.31 mm
15.45×9.31 mm
6.5ct
15.87×9.56 mm
15.87×9.56 mm
7ct
16.27×9.8 mm
16.27×9.8 mm
7.5ct
16.65×10.03 mm
16.65×10.03 mm
8ct
17.02×10.25 mm
17.02×10.25 mm
8.5ct
17.36×10.46 mm
17.36×10.46 mm
9ct
17.7×10.66 mm
17.7×10.66 mm
9.5ct
18.01×10.85 mm
18.01×10.85 mm
10ct
18.33×11.04 mm
18.33×11.04 mm
11ct
18.91×11.39 mm
18.91×11.39 mm
12ct
19.47×11.73 mm
19.47×11.73 mm
13ct
20×12.05 mm
20×12.05 mm
14ct
20.5×12.35 mm
20.5×12.35 mm
15ct
20.97×12.63 mm
20.97×12.63 mm
16ct
21.43×12.91 mm
21.43×12.91 mm
17ct
21.86×13.17 mm
21.86×13.17 mm
18ct
22.29×13.43 mm
22.29×13.43 mm
19ct
22.69×13.67 mm
22.69×13.67 mm
20ct
23.09×13.91 mm
23.09×13.91 mm
22ct
23.84×14.36 mm
23.84×14.36 mm
24ct
24.53×14.78 mm
24.53×14.78 mm
26ct
25.2×15.18 mm
25.2×15.18 mm
28ct
25.83×15.56 mm
25.83×15.56 mm
30ct
26.43×15.92 mm
26.43×15.92 mm
33ct
27.27×16.43 mm
27.27×16.43 mm
36ct
28.09×16.92 mm
28.09×16.92 mm
40ct
29.08×17.52 mm
29.08×17.52 mm
Length-to-width ratio: 1.66, 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 pear-cut Ruby carat weights to their approximate millimeter (mm) sizes:
| Carat Weight | MM Size |
|---|---|
| 0.25 ct | 5.36×3.23 mm |
| 0.5 ct | 6.76×4.07 mm |
| 0.75 ct | 7.72×4.65 mm |
| 1 ct | 8.5×5.12 mm |
| 1.25 ct | 9.16×5.52 mm |
| 1.5 ct | 9.73×5.86 mm |
| 1.75 ct | 10.24×6.17 mm |
| 2 ct | 10.71×6.45 mm |
| 2.5 ct | 11.54×6.95 mm |
| 3 ct | 12.27×7.39 mm |
| 3.5 ct | 12.91×7.78 mm |
| 4 ct | 13.5×8.13 mm |
| 4.5 ct | 14.04×8.46 mm |
| 5 ct | 14.54×8.76 mm |
| 5.5 ct | 15.01×9.04 mm |
| 6 ct | 15.45×9.31 mm |
| 6.5 ct | 15.87×9.56 mm |
| 7 ct | 16.27×9.8 mm |
| 7.5 ct | 16.65×10.03 mm |
| 8 ct | 17.02×10.25 mm |
| 8.5 ct | 17.36×10.46 mm |
| Carat Weight | MM Size |
|---|---|
| 9 ct | 17.7×10.66 mm |
| 9.5 ct | 18.01×10.85 mm |
| 10 ct | 18.33×11.04 mm |
| 11 ct | 18.91×11.39 mm |
| 12 ct | 19.47×11.73 mm |
| 13 ct | 20×12.05 mm |
| 14 ct | 20.5×12.35 mm |
| 15 ct | 20.97×12.63 mm |
| 16 ct | 21.43×12.91 mm |
| 17 ct | 21.86×13.17 mm |
| 18 ct | 22.29×13.43 mm |
| 19 ct | 22.69×13.67 mm |
| 20 ct | 23.09×13.91 mm |
| 22 ct | 23.84×14.36 mm |
| 24 ct | 24.53×14.78 mm |
| 26 ct | 25.2×15.18 mm |
| 28 ct | 25.83×15.56 mm |
| 30 ct | 26.43×15.92 mm |
| 33 ct | 27.27×16.43 mm |
| 36 ct | 28.09×16.92 mm |
| 40 ct | 29.08×17.52 mm |