Hi Michael,

Since you can extract points from the meshes in Rhino, if someone wants to build NURBS surfaces from
the points for some of the more commonly used gemstones, they could. I'll upload some files with points if there's any interest.

Jesse

Edit: I looked at some of the meshes and it seems that unless you work right off the mesh to build surfaces from points, it could be confusing to know which points get connected by lines, so it has to be done in Rhino...I'll do a few of the basic ones.