Semi-inspired by my recent rendering, I'm creating a set of macros to 
generate cut gems. Also, at one point waaaay back in the past, someone 
made a post of diamonds modeled in a piece of software called GemCad. I 
wanted to do something like that, but do it differently:

Pure CSG Diamonds.

So, Here are a couple cuts from a class of cuts called "Old European"

On the left is a Table Cut. Nothing exciting, basically follows the 
natural shape of a diamond. On the right is an Old Single Cut with two 
different parameters. Neither of these are the well-known brilliant cut, 
though the Old Single cut may very well be the basis for the brilliant 
cut, since it already has all of the proper angles.

There are 2 renders: One with a basic material so you can better see the 
shape of the facets, and one with a diamond-like material, complete with 
photons.

The next cuts I'll probably tackle are Eight cut, Emerald and Step cut-- 
since these are relatively simple. Eight cut may be a bit slightly 
challenging because the facets are rounded at the edges, but I might be 
wrong, it could be very simple, especially if the stone has a girdle.

I'm learning all sorts of terminology with this project:

The top "half" is the crown of the gem, the flat facet at the top is 
called the table, the bottom "half" is the pavilion, and space between 
the crown and pavilion is called the girdle, if it exists. At the bottom 
of the pavilion there can be one more facet, called the cullet, or the 
pavilion can come to a point.

I still need to work on cut depth, as well ( which determines the angles 
in the pavilion )

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