What are Rubies and Sapphires chemically known as?
Most people don’t realize that ruby and sapphire are both gems of the mineral corundum. Both of these gems have the same chemical composition and the same mineral structure. Corundum is a rock-forming mineral that is found in igneous, metamorphic, and sedimentary rocks. It is an aluminum oxide with a chemical composition of Al2O3 and a hexagonal crystal structure
