Natural Gemstones

Natural Gemstones is a scientific publication by the Geological Survey, likely written in the late 20th century. It offers a comprehensive overview of natural gemstones, detailing their classification as precious or semiprecious and the geological environments in which they form. The book covers various topics, including mineral descriptions, formation processes, and properties like hardness and specific gravity, making it a valuable resource for collectors and hobbyists. It also provides insights into organic gemstones, valuation, and tips for navigating the market, particularly regarding synthetic gems.