I can be precious yet common, formed over time, and found underground. What am I?

Category: Knowledge · Difficulty: easy

Hint: Consider something often used in jewelry.

Answer

A gemstone

Explanation

A gemstone is a precious or semi-precious stone that is cut and polished for use in jewelry and decoration.

This is an easy knowledge riddle — a good one for children and beginners. The answer is A gemstone.

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