corundum, history.1, Lapidaries, Arab, India, Persia, Sri Lanka, spinel, gems, Arabic mineralogy, Indian lapidary

William Sersen surveys references to rocks, gemstones, and metals in medieval Arabic literature, distinguishing scientific investigation, accounts of supernatural properties, and practical discussions of trade and value. He explains that medieval scholars often treated subjects now separated into gemology, mineralogy, crystallography, petrology, and metallurgy within a broader field of inquiry. Their writings combined observations about the formation, composition, sources, properties, treatment, and worth of stones with medicinal beliefs, talismanic uses, and inherited folklore. Sersen traces an important intellectual influence to Greek and Roman authors, including Xenocrates, Theophrastus, Dioscorides, Aristotle, and Pliny, whose works entered Arabic scholarship through translations beginning in the late eighth century. Citations preserved in Arabic manuscripts can consequently provide evidence for classical writings whose original texts or translations no longer survive. The so-called Stone Book of Aristotle illustrates both this transmission and the problems of attribution: despite its title, it was not written by Aristotle, and some scholars have connected it with Xenocrates. Sersen identifies al-Biruni as an unusually independent thinker who questioned the attribution and conducted specific-gravity experiments on stones, sometimes achieving considerable accuracy. By contrast, medieval cosmographers frequently repeated accounts of extraordinary mineral powers, including the story of a magnetic mountain capable of extracting metal fittings from passing ships. Such narratives reflect both classical traditions and contemporary local beliefs. Other writers addressed commercial and technical matters: al-Dimashqi discussed important trade gemstones, their prices, and tests of authenticity; al-Jahiz considered the quality of gems and metals; Ibn al-Zubayr recorded stone prices and weights; and al-Hamdani described mining productivity in the Arabian Peninsula. Alphabetically arranged stone encyclopedias provided another vehicle for collecting mineral knowledge. Sersen highlights the thirteenth-century work of Ahmad ibn Yusuf al-Tifashi, which includes reports concerning malachite’s derivation from copper, the dyeing of rock crystal to imitate ruby, and ruby heat treatment. A further account by Baylak al-Qabjaqi describes ruby heating in Sri Lanka, which Sersen compares with traditional methods practiced in Thailand’s Chanthaburi Province. He concludes that medieval Arabic lapidary literature remains comparatively little studied and largely untranslated, with existing European-language translations scattered through specialist publications. The article supplies further reading and emphasizes the opportunities these sources offer for investigating the history of gemstone knowledge, commerce, treatments, and beliefs.