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This is significant in dating jewelry since it means gold-backed silver is post-1767, and not from the earliest decades of the Georgian era.However, the absence of gold backing does not mean that a piece is pre-1767.I’ve arranged these chronologically and included items of interest to collectors of both fine and costume jewelry.1767: James Cox developed a method of backing silver with a thin sheet of gold in 1767.Therefore, if jewelry is marked 9, 12, or 15 carat it is post-1854.
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And platinum’s strength allowed for the delicate pierced work characteristic of Edwardian jewelry.
1902: The Vernuil flame-fusion process of creating synthetic sapphires and rubies was invented.
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