Ancient people believed that a topaz would change color when near a poisoned food or drink. Both the Greeks and the Egyptians said a wearer of topaz was protected from harm. Today it's mostly made into jewelry, but this gem has been valued for thousands of years. Readers learn about the stories surrounding topaz, as well as the facts behind its formation in igneous rocks. Brilliant images of these colorful stones prove their value and enhance the geology lesson found in the main content.