While carat weight is a measure of a diamond's weight, and not its size, it is a consistent indicator of how large a diamond will look, when viewed from the top.
Factors such as the diamond shape and its cut will also affect the size. Some shapes of the same carat weight may look larger or smaller when compared and viewed from the top. Similarly a good, fair or poor cut diamond may sometimes make a diamond look smaller than another "excellent" cut diamond of the same weight. To help illustrate how diamonds of different carat weight look, we have composed this visual guide.
Here is a quick view comparison, with a full view on a hand, following below.
We start off with a 0.30ct round diamond.
Next is a 0.50ct:
Below, is a 0.70ct diamond:
The most popular and well known of all diamond carat weights, the 1.00ct round diamond is shown below:
Finally, a 1.50ct round brilliant diamond is shown below.
If you would like to find out how a size now shown here or a different diamond shape would look set in a ring or on a hand, then please make a request by e-mailing info[at]rarepink.com