3.52 is the specific gravity of diamond.
1.) Round faceted stones ... diameter × diameter × depth × 3.52 × 0.0018
2.) Oval faceted stones ... diameter × diameter
× depth × 3.52 × 0.0020
(To get the diameter of an oval, average out the length and width)
3.) Step-cut faceted stones ... length × width ×
depth × 3.52 × 0.0025
(This is for step cuts with cut-corners, aka emerald cut stones)
4.) Rectangular faceted stones ... length × width
× depth × 3.52 × 0.0026
(I.E. rectangular princess cuts, etc.)
5.) Square faceted stones ... length × width ×
depth × 3.52 × 0.0023
(I.E. Princess cuts, quadrillion cuts, etc.)
6.) Marquise faceted stones ... length × width × depth × 3.52 × 0.0016
7.) Pear faceted stones ... length × width × depth × 3.52 × 0.00175
8.) Square cushion faceted stones ... diameter ×
diameter × depth × 3.52 × 0.0018
(Measure between one corner to its diagonal corner, and the other to
the other, average them to get diameter)
9.) Rectangular cushion faceted stones ... diameter ×
diameter × depth × 3.52 × 0.0022
(Average the length and width to get the diameter)
10.) Square step cut ... diameter × diameter ×
depth × 3.52 × 0.0023
(Average the length and width to get the diameter. This is for square,
four-sided stones.)
11.) Rectangular step cut ... length × width ×
depth × 3.52 × 0.0025
(I.E. baguettes, etc. This is for rectangular, four-sided stones.)