What is a gem?
Gems and Value:
By far the most valuable gemstones in the world are diamonds, which can be worth thousands of dollars per carat. By contrast, gemstones like amethyst are worth very little, as they can be found in many places throughout the world.
Answer and Explanation:
A gem is a mineral crystal that has a particular aesthetic and financial value to people. While few gemstones have any inherent value (although...
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from Geology 101: Physical GeologyChapter 2 / Lesson 3