What is sapphire glass?
First of all, to be clear, sapphire could not have been called glass. Glass is a silica-based transparent post-fusion solidified body to which various elements have been added in order to meet different requirements, but the main component is silica. Sapphire is a crystal, a single-crystal arrangement of aluminum trioxide. Because sapphire becomes transparent after polishing, it is also called sapphire glass.
Sapphire glass...