Diamond size comparison
On a hand
The ring size shown is 16.5 mm — the average women's size.
* The setting that holds the stone is not shown.
1 ct ⌀ 6,5 mm
Above 2 ct we source the stone to order — tell us the weight and we will quote it.
Carat to millimetres
| Carat | Round | Oval | Radiant / Emerald | Pear |
|---|---|---|---|---|
| 0,5 | ⌀ 5 | 6,3 × 4,5 | 5,6 × 4 | 6,7 × 4,2 |
| 0,8 | ⌀ 5,9 | 7,3 × 5,2 | 6,5 × 4,7 | 7,9 × 5 |
| 1 | ⌀ 6,5 | 7,9 × 5,6 | 7 × 5 | 8,5 × 5,3 |
| 1,2 | ⌀ 6,7 | 8,4 × 6 | 7,4 × 5,4 | 9 × 5,7 |
| 1,5 | ⌀ 7,3 | 9,1 × 6,5 | 8 × 5,8 | 9,7 × 6,1 |
| 2 | ⌀ 8 | 10,1 × 7,2 | 8,8 × 6,3 | 10,7 × 6,7 |
Weight fills three dimensions; a finger only shows two. A 2 ct round covers about 151% of the area of a 1 ct — not 200% — which is why the jump from 1 ct to 1.5 ct is the one most people can actually see, and the jump above that mostly is not.
Shape changes it again. An elongated stone carries its weight along a longer outline, so it reads larger on the finger than a round of exactly the same weight — for exactly the same money.
The measurements hold for stones of normal proportions. A well-cut lighter stone can look larger than a heavier one. On the finger, fire matters more than weight — which is exactly why cut is the C never to save on.