Solve this multiple-choice question and choose the correct option.

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Basic classification: Which of the following is an element (not a compound/mineral)? Identify the choice consisting of a single chemical element in its pure form. Choose the correct option.

Difficulty: Easy

Diamond
Ruby
Sapphire
Emerald

Correct Answer: Diamond

Explanation:

Given data

Options include gemstones and one elemental form.

Concept/Approach Diamond is pure crystalline carbon (an allotrope → element). Ruby/sapphire are corundum (Al₂O₃) with dopants; emerald is beryl (Be₃Al₂(SiO₃)₆).

Final Answer Diamond

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