June 21st 2022
Diamond Size Chart
By Devin Jones
Select a specific diamond shape to see more detailed information and diamond size charts for each.
Round
Cushion
Emerald
Oval
Princess
Pear
Radiant
Asscher
Heart
MarquiseDiamond Carat Size Chart
As you can see from the below diamond carat size table, marquise diamonds have the largest average length & width due to their elongated shape. Princess cut diamonds have the smallest average length & width per carat.
The numbers below represent the average length and width in millimeters for each shape.
| Carat Weight | Asscher | Cushion | Emerald | Heart | Marquise | Oval | Pear | Princess | Radiant | Round |
|---|---|---|---|---|---|---|---|---|---|---|
| 0.3 carat | 3.8 mm | 3.8 mm | 3.9 mm | 4.4 mm | 5.2 mm | 4.5 mm | 4.8 mm | 3.7 mm | 4 mm | 4.3 mm |
| 0.4 carat | 4 mm | 4.1 mm | 4.2 mm | 4.8 mm | 5.7 mm | 5 mm | 5.3 mm | 4 mm | 4.3 mm | 4.7 mm |
| 0.5 carat | 4.3 mm | 4.5 mm | 4.5 mm | 5.2 mm | 6.1 mm | 5.3 mm | 5.7 mm | 4.3 mm | 4.6 mm | 5 mm |
| 0.6 carat | 4.6 mm | 4.7 mm | 4.8 mm | 5.5 mm | 6.5 mm | 5.7 mm | 6 mm | 4.5 mm | 4.9 mm | 5.4 mm |
| 0.7 carat | 4.8 mm | 5 mm | 5 mm | 5.7 mm | 6.8 mm | 5.9 mm | 6.3 mm | 4.8 mm | 5.1 mm | 5.6 mm |
| 0.8 carat | 5.1 mm | 5.2 mm | 5.3 mm | 6 mm | 7.1 mm | 6.2 mm | 6.6 mm | 5 mm | 5.3 mm | 5.9 mm |
| 0.9 carat | 5.2 mm | 5.4 mm | 5.5 mm | 6.2 mm | 7.4 mm | 6.4 mm | 6.8 mm | 5.2 mm | 5.5 mm | 6.1 mm |
| 1 carat | 5.4 mm | 5.6 mm | 5.7 mm | 6.4 mm | 7.7 mm | 6.7 mm | 7.1 mm | 5.3 mm | 5.7 mm | 6.3 mm |
| 1.5 carat | 6.2 mm | 6.5 mm | 6.5 mm | 7.4 mm | 8.7 mm | 7.7 mm | 8.1 mm | 6.2 mm | 6.6 mm | 7.3 mm |
| 2 carat | 6.9 mm | 7.2 mm | 7.2 mm | 8.1 mm | 9.6 mm | 8.4 mm | 8.9 mm | 6.8 mm | 7.3 mm | 8 mm |
| 2.5 carat | 7.4 mm | 7.7 mm | 7.8 mm | 8.7 mm | 10.3 mm | 9.1 mm | 9.6 mm | 7.4 mm | 7.8 mm | 8.7 mm |
| 3 carat | 8 mm | 8.2 mm | 8.2 mm | 9.2 mm | 11.2 mm | 9.6 mm | 10.1 mm | 7.8 mm | 8.3 mm | 9.2 mm |
| 3.5 carat | 8.3 mm | 8.6 mm | 8.6 mm | 9.7 mm | 11.6 mm | 10.2 mm | 10.8 mm | 8.3 mm | 8.7 mm | 9.7 mm |
| 4 carat | 8.7 mm | 9 mm | 9 mm | 10.4 mm | 12.1 mm | 10.6 mm | 11.2 mm | 8.6 mm | 9.3 mm | 10.2 mm |
| 5 carat | 9.5 mm | 9.7 mm | 9.6 mm | 11 mm | 13.4 mm | 11.3 mm | 12 mm | 9.1 mm | 9.9 mm | 10.9 mm |
| Shape | 1 Carat | 2 Carat | 3 Carat | 4 Carat | 5 Carat |
|---|---|---|---|---|---|
| Asscher | 5.4 mm | 6.9 mm | 8 mm | 8.7 mm | 9.5 mm |
| Cushion | 5.6 mm | 7.2 mm | 8.2 mm | 9 mm | 9.7 mm |
| Emerald | 5.7 mm | 7.2 mm | 8.2 mm | 9 mm | 9.6 mm |
| Heart | 6.4 mm | 8.1 mm | 9.2 mm | 10.4 mm | 11 mm |
| Marquise | 7.7 mm | 9.6 mm | 11.2 mm | 12.1 mm | 13.4 mm |
| Oval | 6.7 mm | 8.4 mm | 9.6 mm | 10.6 mm | 11.3 mm |
| Pear | 7.1 mm | 8.9 mm | 10.1 mm | 11.2 mm | 12 mm |
| Princess | 5.3 mm | 6.8 mm | 7.8 mm | 8.6 mm | 9.1 mm |
| Radiant | 5.7 mm | 7.3 mm | 8.3 mm | 9.3 mm | 9.9 mm |
| Round | 6.3 mm | 8 mm | 9.2 mm | 10.2 mm | 10.9 mm |
