Diamond weight and diamond sizes
The size of a diamond is its weight measured in carats. The more a diamond weighs, the bigger it is.
Play with our Diamond Size Widget below. Discover what different diamond sizes look like on a real hand.
Below are the measurements for the diamonds we sell, which will help you understand diamond sizes.
Please note we always sell as “total diamond weight”. For example, if you buy a pair of earrings, the carats refer to the total diamond weight in the two earrings. If you’re buying a ring with several diamonds, the weight equals the total carats of diamonds in the ring.
If you would like a real sense of scale, follow this link for “real size” images of our diamonds:
REAL SIZE DIAMOND MEASUREMENTS
| Round Brilliant Cut Diamonds | Diameter mm |
|---|---|
| 0.10ct | 3.00mm |
| 0.20ct | 3.80mm |
| 0.25ct | 4.00mm |
| 0.30ct | 4.20mm |
| 0.40ct | 4.80mm |
| 0.50ct | 5.00mm |
| 0.70ct | 5.75mm |
| 1.00ct | 6.50mm |
| Square Princess Cut Diamonds | Width mm |
|---|---|
| 0.10ct | 2.50mm |
| 0.20ct | 3.20mm |
| 0.25ct | 3.40mm |
| 0.30ct | 3.60mm |
| 0.40ct | 4.00mm |
| 0.50ct | 4.40mm |
| 0.70ct | 4.80mm |
| 1.00ct | 5.50mm |
| Emerald Cut Diamonds | Length & Width |
|---|---|
| 0.25ct | 4mm x 3mm |
| 0.33ct | 5mm x 3mm |
| 0.50ct | 8mm x 4mm |
| 1.00ct | 10mm x 5mm |
| Pear Shape Diamonds | Length & Width |
|---|---|
| 0.30ct | 5mm x 3mm |
| 0.50ct | 6mm x 4mm |
| 1.00ct | 8mm x 5mm |
| Marquise Diamonds | Length & Width |
|---|---|
| 0.25ct | 5mm x 3mm |
| 0.50ct | 8mm x 4mm |
| 0.75ct | 9mm x 4.5mm |
| 1.00ct | 10mm x 5mm |