The “Photoatlas of Inclusions in Gemstones” by Eduard J. Gübelin and John I. Koivula is a vintage first edition collector’s book published in 1986 by ABC Edition in Zurich. This illustrated nonfiction book, originally written in German, is intended for adult readers interested in the world of gemstones, mineralogy, and gemology. The photoatlas showcases various inclusions found in gemstones, making it a valuable resource for those passionate about the mathematics and sciences of nature and the Earth. This book is a must-have for collectors and enthusiasts in the field of gemology.