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Analogy (mineral → gemstone): Complete the pair. Given: Carbon → Diamond (diamond is a crystalline form/gem derived from carbon). Asked: Corundum → ? Choose the correct option.

Difficulty: Easy

Ruby
Emerald
Quartz
Topaz

Correct Answer: Ruby

Explanation:

Given data

Carbon → Diamond (a gemstone form of carbon).
Corundum (Al₂O₃) has gem varieties: ruby (red) and sapphire (other colours).

Concept/Approach
Match "mineral → celebrated gemstone variety".

Reasoning
The classic analogy pairs corundum with its famed red gem variety: Ruby.

Note
Sapphire is also corundum, but ruby is the most conventional single answer in such analogies.

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