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The semi-precious gemstone not belonging to corundum is _______________

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The semi-precious gemstone not belonging to corundum is _______________

(a) Ruby

(b) Sapphire

(c) Diamond

(d) Oriental emerald

This question was posed to me during an internship interview.

My question is taken from Formation and Descriptive Study of Minerals topic in portion The Study of Minerals of Engineering Geology

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Right choice is (c) Diamond

The best I can explain: Some common forms of corundum used as precious or semi-precious gemstones are ruby, sapphire, oriental emerald and oriental topaz. Diamond is a completely different mineral and is not considered to be a form of corundum.

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