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

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