【中国】2019 Auction Records for Opal Rough Stones: Historical Price Trends and Highest Records
Editor’s NoteThis article provides a brief overview of the historical auction records for opal rough stones, highlighting their emergence in the…
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【Quebec, Cana】Hidden Treasures: The Precious and Semi-Precious Stones of Quebec
Editor’s NoteThis article explores the fascinating geological and historical origins behind the phrase “As false as a Canadian diamond,” tracing it…