gems, history of gemology, gem treatments, alchemy, corundum, treatments.6, Greek science

This volume, compiled by Marcellin Berthelot, presents and analyzes two of the oldest surviving texts of ancient Greek alchemy: the Papyrus of Leiden and the Papyrus of Stockholm, along with a collection of additional alchemical recipes." Dating from roughly the 3rd to 4th centuries CE, these documents record practical instructions for the preparation of dyes, metal alloys, artificial gemstones, and chemical substances, revealing a blend of artisanal techniques and early scientific experimentation. Berthelot offers transcriptions, translations, and commentary that highlight how ancient practitioners sought to imitate and transform natural materials, illuminating the origins of later alchemical traditions and early technological knowledge."