A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public

This practical manual teaches fundamental methods for identifying and evaluating precious stones, presenting trade techniques and the underlying science in accessible language. It explains optical phenomena such as refraction, double refraction, absorption and dichroism, and covers physical tests including specific gravity, hardness, luster and dispersion, alongside systematic treatment of color. Emphasis is placed on distinguishing natural gems from synthetics and imitations using simple, repeatable examinations and worked examples. Arranged as numbered lessons for study in spare moments, the work blends laboratory principles with shop practice and offers guidance for merchants, clerks, and interested readers to improve examination skills and purchasing judgment.