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Written by Joey Gage — Director of Opal Science, Founder of OPL Academy, creator of Hydrophane Behavior Science (HBS), and leading authority on modern Opal research. Opal: The Queen of Gems — Fourth Edition (Revised & Expanded) is the most advanced, science‑driven Opal guide available. Updated with new OPL research, HBS hydration‑front models, stability insights, and expanded pattern classification, this edition gives collectors and sellers the tools to identify real Opal, detect fakes, understand hydrophane behavior, and navigate today’s gray‑market risks. Includes the refined OPL Pattern System, scam‑defense strategies, treatment detection, and field‑ready identification methods. Essential for collectors, gemologists, lapidaries, and anyone buying or selling Opal.