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Some of Earth's greatest beauty is found deep underground or hides in the shell of a mollusk. This series, presented by Scientific American, introduces readers to how some of the world's most popular gems form, from golden amber and lovely amethysts to creamy pearls. The set covers geology concepts such as the rock cycle, the features of minerals, and how gems are identified. Where applicable, a discussion of over-mining and environmental concerns are addressed. Beautiful, full-color photographs enhance the understandable text.