The stage before what was shown may involve actual cutting/sawing and or cleavage. https://en.wikipedia.org/wiki/Cleavage_(crystal) https://en.wikipedia.org/wik

The stage before what was shown may involve actual cutting/sawing and or cleavage. https://en.wikipedia.org/wiki/Cleavage_(crystal) https://en.wikipedia.org/wiki/Cleavage_(crystal) This allows you to preserve material for making multiple gems where grinding can only result in a single piece.