Lead glass-filled rubies represent material that is heavily treated to improve transparency. The treatment is highly unstable, resulting in stones that can be easily damaged beyond repair. The material is relatively easy to identify using a gemological microscope or jeweler's 10x loupe. Tell-tale signs include: a flash-effect, large gas bubbles in a stone's cavities, or flattened bubbles confined to wide fractures filled with glass. Avoid any jewelry repair procedure and keep the material out of solvents, including basic household cleaning solutions. Sometimes called composite ruby, hybrid ruby, ruby with glass, or a host of other names, GIA considers some of this material so heavily treated that it does not warrant being called ruby at all, but rather a manufactured product.
To gain a deeper understanding of this material, read "A Discussion on Ruby-Glass Composites & Their Potential Impact on the Nomenclature in use for Fracture-Filled or Clarity Enhanced Stones in General" (February 2012).
Source GIA Global Dispatch / www.GIA.edu
TAKE NOTE EVERYONE....BEWARE!!!MAKE A RESEARCH BEFORE BUYING IT.