The by Eduard J. Gübelin and John I. Koivula is universally recognized as the "bible" of gemstone inclusions. Spanning three massive volumes, this work is the definitive visual reference for identifying gemstone origins, distinguishing between natural and synthetic stones, and detecting treatments. Comprehensive Review

The weight of this book is carried by the reputations of its authors. Eduard Gübelin was a visionary who legitimized the study of inclusions, and John Koivula is arguably the most brilliant photomicrographer of the modern era. Their combined expertise ensures that the identifications are accurate and the scientific reasoning is sound. When you read this book, you are not just looking at pictures; you are learning how to think like a detective.