Communal Grinding Wheel.  Preparing "gueda" for the high temperature heat treatment ovens 
where every structural flaw must be sawed or ground away before heating, less the stone explode!
All gueda players are gamblers and usually anxious to see if their piece of rough will yield a 
valuable gem.  The gueda market is the trickiest aspect of the Sri Lankan gem trade with fortunes 
sometimes being made (and sometimes lost) overnight!