Gemstone manufacturing in the Arab scientific heritage from the Umayyad Era to the end of the Mamlūk Era (41-923 AH/ 662-1517AD): A cultural historical study

Abstract

This research investigates the advanced experimental methodologies developed by Arabic chemists (8th-14th Calendar centuries) for the synthesis and imitation of gemstones, with a primary focus on the corpora of Jābir ibn Ḥayyān [1]. Diverging from traditional historiography that often relegates these works to the realm of allegorical alchemy, this study provides evidence of early "materials engineering" based on a sophisticated understanding of the optical and mechanical properties of inorganic substances. By analyzing historical recipes through the lens of modern solid-state chemistry, the paper reveals Arabic pioneering in four technical domains: First, refractive index tuning is done through the strategic incorporation of lead oxides into silicate glass matrices in order to enhance optical dispersion. Second, the management of redox potentials to precisely control the chromatic spectra of transition metal ions such as copper, iron, and manganese. Third, crystal growth via chemical vapor transport is evidenced by protocols involving the sublimation and condensation of arsenic sulfides to produce high-purity crystalline solids. Finally, colloidal and substrate engineering is utilized in order to plaster calcium-based carriers and organic binders to stabilize organometallic pigments. The findings demonstrate that these protocols functioned as "Standard Operating Procedures" (SOPs) aimed at engineering synthetic alternatives that replicate the specific gravity, hardness, and refractive indices of natural rubies, emeralds, and lapis lazuli. By achieving these objectives, the study contributes to a significant re-evaluation of the history of materials science, positioning medieval Arabic chemistry as a direct precursor to modern glass technology and solid-state physics.