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Dating Jewelry - Precious Metal Hallmarks - By: blog.RubyLane.com, 2009-11-07 The use of hallmarks on jewelry and objects made from precious metal began in the 1400’s, however many unmarked pieces exist. The passage of time and repair work has marred or eliminated marks from many pieces making them harder to identify the precious metal content, the country of manufacturer or the maker. COMMENTS Add a comment |