"The Gem" by Smithsonian is a comprehensive visual guide that provides in-depth information about various aspects of gemstones. Written in English, this book serves as a valuable resource for anyone interested in the world of gemology. With the Smithsonian's expertise and detailed explanations, readers can expect to gain a deeper understanding of the properties, characteristics, and beauty of different gemstones. The visual guide aspect of the book also provides stunning imagery to accompany the information, making it a rich and informative read for enthusiasts and professionals alike.