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Detail: Belle Epoque diamond and ruby plaque-de-cou, circa 1905.  A plaque-de-cou is a collier de chien ("dog" collar featuring a large rectangular or square plaque suspended on a ribbon or strands of pearls.

Detail: Belle Epoque diamond and ruby plaque-de-cou, circa A plaque-de-cou is a collier de chien ("dog" collar featuring a large rectangular or square plaque suspended on a ribbon or strands of pearls.