This book investigates the geological origins, identification, and commercial significance of Australian precious opal. Dr. Archie Kalokerinos, a medical professional with a long-standing interest in the field, utilizes his extensive experience in the Australian outback to provide a comprehensive overview of opal mining and classification. The text serves as a technical resource for understanding the unique conditions required for the formation of these gemstones within the Australian landscape.

Readers frequently note the practical focus of the text, which bridges the gap between amateur interest and professional gemology. Experts highlight this as a useful reference for those interested in the specific history and characteristics of Australian opal deposits.