A practical handbook surveying the physical and optical properties, crystal forms, and locality occurrences of gemstones in Texas, accompanied by tables and photographs. It explains basic crystallography and gem-cutting techniques including cabochon, faceting, and tumbling methods, with step-by-step guidance and illustrations. Individual mineral entries summarize composition, hardness, specific gravity, luster, color variations, and notable Texas localities for species such as amber, celestite, various quartz types, topaz, tourmaline, and tektites. Concluding sections provide a glossary, selected references, and an index to assist collectors, students, and amateur lapidaries.