Diamond shape (Flat Bottom) - Brilliant cut 58

I was looking for a "jewel" for my daughter's cosplay, but all the diamonds on Thingiverse were "complete" diamonds... I wanted one with a flat bottom to glue onto another flat surface... and the STL Meshes I was able to download / customize wouldn't easily edit...

So, I took the SCAD script from "takuya" (thanks btw), and simply got rid of everything below the z plane, making it flat. The script works identical to the original, and you can customize as you like, but you'll only get the top