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Introduction to Opals by SSEF
First Section
Introduction to Opals
What are Opals?
Main Types of Precious Opal
Cutting Opal
History of Opals
Opal Sources
The Science of Testing Opals
Assembled Opals, Imitations and Nomenclature
Colours and Characteristics of Opals
Famous Opals
Quiz on Opals
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What are Opals?
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