Princess shape lab-grown diamonds also tend to have a slightly lowerthan round cut diamonds. This is because the four-sided pyramid shape of the princess cut diamond is similar to one half of the octahedron rough stone from which a princess shape lab-grown diamonds. This similarity allows two equally sized princess cut diamonds to be cut from the same rough stone with relatively little waste (roughly 60% of the weight of the original rough stone is retained after cutting). The greater efficiency, or , translates to a lower price.
Carat for carat, thesurface area of a princess cut is about 10% less than a same-weight round diamond. However, the corner to corner measure of a princess cut is typically 15% greater than the diameter of a same-weight round diamond, creating the illusion of greater size.