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Cubic Zirconia and Zircon - By: blog.RubyLane.com, 2009-10-25 Cubic Zirconia has no true natural counterpart, and is not a synthetic version of natural zircon. It is a man made version of zirconium oxide. There are several naturally occurring zirconium oxides, none of which have any commercial importance, and none of which are used in jewelry. COMMENTS Add a comment |