Hi Pilou,

You are very observant! :-)


Possibly they made every other one flat so the stone
would look rounder? I don't know.

There are very precise proportions which optimize
the refraction of light in an "Ideal Cut" round diamond.. it's sort of a science.
The Modern Brilliant cut is supposed to be optimized for how light reflects
based on the crystalline structure of the molecules, but most diamond
cutters balance the ideal with economy for all but the best stones..
they are careful not to cut away too much material,
thereby reducing the carat weight and cost to the customer. :-)

http://en.wikipedia.org/wiki/Round_brilliant
http://diamonds.pricescope.com/girdle.asp

A 3D viewer for diamond models
http://www.octonus.com/oct/products/3dcalc/standard/

There are free meshes of gemstones on this site,
http://www.3dlapidary.com/HTML/Collections.htm
but unfortunately they aren't in a format that MoI can open.


Jesse