Diamond Weight and Diamond Sizes

The size of a diamond is referred to by its weight in carats. The more a diamond weighs, the bigger it is.

Please note that we always sell as "total diamond weight". So for example if you buy a pair of earrings, the weight is the total weight of the diamonds in the two earrings. If you are buying a ring with a number of diamonds, then the weight quoted will be for the total weight of all the diamonds in the ring.

Below are the measurements for the diamonds we sell, which will help you understand diamond sizes.

If you would like a real sense of scale, follow this link for "real size" images of our diamonds:

Real size diamond measurements

round shape diamond
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 shape diamond
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
marquise shape diamond
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
emerald shape diamond
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 diamond
Pear Shape Diamonds Length & Width
0.30ct 5mm x 3mm
0.50ct 6mm x 4mm
1.00ct 8mm x 5mm