Diamond Weight Estimation

This is for estimating the weight of loose diamonds. I am searching for the formula for rose cuts, which are basically cabochons covered with triangular facets coming up to a point.

This section of my site was originally "Gemstone Weight Estimation", but I realized the formulas were meant for diamond. I know formulas for other gemstones exist, but I don't know what they are, or I would post them here.

3.52 is the specific gravity of diamond.

Rounds = ..........................Diameter x Diameter x Depth x .0061

Ovals = ..............................Length x width x Depth x .0062

Princess Cuts = ..............Length x width x depth x .0083

Heart Cuts = ...................Length x width x depth x .0059

Triangle Cut = ...............Length x width x depth x .0057

Emerald Cut = ...............Length x width x depth x factor: Factor........Length to width ratio .0080 1.00 : 1 .0092 1.50 : 1 .0100 2.00 : 1 .0106 2.50 : 1

Marquise Cut = .............Length x width x depth x factor: Factor........Length to width ratio .00565 1.50 : 1 .00580 2.00 : 1 .00585 2.50 : 1 .00595 3.00 : 1

Pear Cut = ......................Length x width x depth x factor: Factor........Length to width ratio .00615 1.25 : 1 .00600 1.50 : 1 .00590 1.66 : 1 .00575 2.00 : 1