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It is OK, rubies are easy to make artificially as they are made out of Aluminium Oxide. However there is one particular gem mineral (Spinel) that looks like ruby and some of the world's most famous rubies are not rubies but Spinels. eg. the Black Prince's Ruby and the "Timur ruby" in the British Crown Jewels are in fact spinels.

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Q: Is there a different mineral that can be used if you run out of rubies?
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