The most noticeable feature that distinguishes the Princess from the Radiant Cut is that the Radiant has the corners cut off, creating an eight sided figure, whereas the Princess has sharp, pointed corners and is four sided. Although they appear similar they are technically two very different cuts. Both cuts come in square and rectangular (elongated) forms. A common misconception is that the Radiant is rectangular and the Princess is square

Princess

Radiant

A 1:1 ratio is square and a 1.3:1 is considered rectangular. (See Table and Depth Percentage Formulas.)

Approximate carat weight of an Princess or Radiant Cut diamond=Length x Width x Depth x 0.084

The above weight formula provides an estimate. The actual weight may vary up to 10%, depending on the make, girdle thickness, and accuracy of the measurement tools.