What are Rubies and Sapphires chemically known as?

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Q: 113 (IAS/2008)
What are Rubies and Sapphires chemically known as?
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question_subject: 

Science

question_exam: 

IAS

stats: 

0,43,80,46,43,17,17

keywords: 

{'sapphires': [0, 0, 1, 0], 'rubies': [0, 0, 1, 0], 'silicon dioxide': [0, 0, 1, 0], 'aluminium oxide': [0, 1, 1, 0], 'boron nitride': [0, 0, 1, 0], 'lead': [7, 1, 11, 11]}