Pilou, bemfamer, Death, Burrman, Phiro, Grendel, you are awesome and your input
is very much appreciated.

This Cabochon shape is really interesting, it looks like four symmetrical planes with
a curved tip and the very top unifying all four surfaces being additionally rounded in
a bit different way.

In regard of this endeavour I stumbled over the great little Squircle Script - is there a
difference in it to the "perfect ellipse" script which I was unable to find ?

TOM