4ct Dark Outer Skin Kashmir Rough

Sapphire from Kashmir are the  most difficult to manufacture in the world.   This Kashmir rough with a dark outer skin surprised us.  

This stone appeared to have a low value until we cut a window and observed down the C-axis.  The 'hidden gem' was literally on the inside.  

My former cutting teacher who would say 'it's rarely a good surprise in cutting rough'  would be happy to see this piece.