Quote Originally Posted by medusa View Post
yup... my casters do stone set wax casting. I fired an artificial emerald in pmc once. it didn't fare well although the colour is fine and I quite liked the rather organic shape it became.
Beryls (aquamarine,emerald,morganite,bixabit, etc) contain water in the crystal lattice, water at 700 degrees creates incredble pressure.

Julian