How do I find my diamond weight? without a diamond scale.
We all know that weighing a diamond is the best way to determine its carat weight, but what should you do if you can't? For example, are you looking for the diamond weight on your engagement or heritage ring? It is possible to calculate a diamond's carat weight by measuring its size. Keep in mind that an estimate made in this manner is not perfect, but it will give you an idea of how much a diamond weighs.
| Round MM Size | Round Carat Weight | Round MM Size | Round Carat Weight | |
|---|---|---|---|---|
| 0.8 mm. | 0.0025 ct. | 7 mm. | 1.30 ct. | |
| 1 mm. | 0.005 ct. | 7.3 mm. | 1.50 ct. | |
| 1.1 mm. | 0.0067 ct. | 7.5 mm. | 1.67 ct. | |
| 1.2 mm. | 0.009 ct. | 7.75 mm. | 1.75 ct. | |
| 1.25 mm. | 0.01 ct. | 8 mm. | 2.00 ct. | |
| 1.3 mm. | 0.01 ct. | 8.25 mm. | 2.11 ct. | |
| 1.5 mm. | 0.015 ct. | 8.5 mm. | 2.43 ct. | |
| 1.75 mm. | 0.02 ct. | 8.7 mm. | 2.50 ct. | |
| 1.8 mm. | 0.025 ct. | 9 mm. | 2.75 ct. | |
| 2 mm. | 0.03 ct. | 9.1 mm. | 3.00 ct. | |
| 2.2 mm. | 0.04 ct. | 9.5 mm. | 3.35 ct. | |
| 2.5 mm. | 0.06 ct. | 9.75 mm. | 3.61 ct. | |
| 2.75 mm. | 0.08 ct. | 10 mm. | 3.87 ct. | |
| 3 mm. | 0.10 ct. | 10.25 mm. | 4.16 ct. | |
| 3.25 mm. | 0.14 ct. | 10.5 mm. | 4.41 ct. | |
| 3.5 mm. | 0.17 ct. | 10.75 mm. | 4.57 ct. | |
| 3.75 mm. | 0.21 ct. | 11 mm. | 4.91 ct. | |
| 4 mm. | 0.25 ct. | 11.25 mm. | 5.49 ct. | |
| 4.25 mm. | 0.28 ct. | 11.5 mm. | 5.85 ct. | |
| 4.5 mm. | 0.36 ct. | 12 mm. | 6.84 ct. | |
| 4.75 mm. | 0.44 ct. | 12.25 mm. | 7.26 ct. | |
| 5.0 mm. | 0.50 ct. | 12.5 mm. | 7.36 ct. | |
| 5.25 mm. | 0.56 ct. | 12.75 mm. | 7.52 ct. | |
| 5.5 mm. | 0.66 ct. | 13 mm. | 8.51 ct. | |
| 5.75 mm. | 0.75 ct. | 13.5 mm. | 9.53 ct. | |
| 6 mm. | 0.84 ct. | 14 mm. | 10.49 ct. | |
| 6.25 mm. | 0.93 ct. | 15 mm. | 12.89 ct. | |
| 6.5 mm. | 1.00 ct. | 16 mm. | 16.06 ct. | |
| 6.8 mm. | 1.25 ct. |
