How do you use the word gem?

How do you use the word gem?
Gem sentence example

A diamond is the hardest, most resilient, most beautiful gem of all.
The gem meant something to her.
The gem is protected by it.
His eyes were brighter than the moon, greener than any gem she’d ever dreamt of.
Your goal is to steal a necklace with a red gem on it.

Gem sentence example
  1. A diamond is the hardest, most resilient, most beautiful gem of all.
  2. The gem meant something to her.
  3. The gem is protected by it.
  4. His eyes were brighter than the moon, greener than any gem she’d ever dreamt of.
  5. Your goal is to steal a necklace with a red gem on it.