Downing, Paul B., Ph.D. Opal cutting made easy / by Paul B. Downing - Completely rev. and expanded - [Tallahassee, FL : Majestic Press] , 1993. - 97 p. : ill. (some col.) ; 23 cm. "Step-by-step guide to cutting opal for the beginner and advanced cutter." Includes index. ISBN: 9780962531149 LCCN: 93138226 Subjects--Topical Terms: Gem cutting---Handbooks, manuals, etc.Opals Dewey Class. No.: 736.2 DOW