Has anyone developed a weight estimation formula for mounted
princess cut diamonds?
Methods for estimation gemstone weight had been known for many
The general formula is is length X width X depth X shape modifier X
SG x correction factor.
Shape modifier for princess is 0.29 Correction factor is where
experience and observation skills come into play.
Formula works fine as long as it is ideal cut. For ideal cut
correction factor is 1.
Any deviations from correct proportions has to be accounted in
For shallow crowns and/or shallow pavilions correction factor is
less than 1.
Pavilion bulges, thick girdles, extra large culets, and etc. -
correction factor is greater than 1 and in some extreme cases can
approach 1.7 or even greater.