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Gems are familiar to most people for their use in jewelry. Less considered are their origins--deep within Earth for most. In this ongoing series, a collaboration with Scientific American, readers learn how some of the world's most popular gems form, including amber, rubies, and topaz. Each carefully researched volume includes introductions to essential geology concepts such as the rock cycle, fossilization, and mineral features. Topics, including jewelry-making with gems and the environmental impact of mining, are supported and enhanced by vivid photographs, while fact boxes add more interesting STEM content.