- 25 Different stones--Dig in to some of the world's most rare, popular, and colorful gems, from amethyst and opal to pearl and ruby.
- The parts of a gem--Learn how gems are classified by things like color, shape, streak, luster, and parent minerals, and what these properties mean about where the gem came from.
- Earth science basics--Explore the scientific principles behind how rocks form, how gems form inside them, and what makes them so valuable and beautiful.
Rock hounds, get ready! It's time to explore the incredible world of gems.