Sapphire glass is not really glass as glass is comprised mostly of silicone dioxide. Sapphire glass is composed of colorless aluminum oxide. The gemstones are colored because of impurities in the sapphire.
15 posted on 09/10/2014 8:54:45 AM PDT by Blood of Tyrants
(The cure has become worse than the disease. Support an end to the WOD now.)