Druzy or Drusy
Drusies are made from a nutural process of crystals that form on the matrix.  Most formations are on agates.  
These stones have a beauty of thier own but can be enhanced to an irredecent finish by adding a titanium .
This is done bydepositing a film of metal only a few atoms thick on a natural drusy gemstone through high-tech 
chemical vapor deposition in a vacuum chamber.