What are Rubies and Sapphires chemically known as?

Silicon dioxide

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Aluminium oxide

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Lead tetroxide

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Boron nitride

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Solution

The correct option is B
Aluminium oxide

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.

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Ruby and sapphire are gem forms of which mineral?

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