Necklaces: Antique/vintage.
Art Nouveau Plique-a-jour Enamel, Ruby, and Diamond Necklace, the shaped plique-a-jour enamel plaques set with cabochon and circular-cut rubies, and old European and rose-cut diamonds, platinum-topped 18kt gold mount, and completed by delicate 14kt white gold filigree chain, lg. 20 3/8 in., Continental hallmark. Via Skinner.
Source : http://diamondsinthelibrary.tumblr.com/post/474922
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