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Detail: Art Nouveau plique-à-jour enamel, peridot, and diamond necklace, circa 1900. Via Diamonds in the Library.

Side enamel detail: Art Nouveau plique-à-jour enamel, peridot, and diamond necklace, circa 1900. Via Diamonds in the Library.

An Art Nouveau Gold, Emerald, Diamond, Plique-à-Jour Enamel Brooch, Marcus & Co., Circa 1900

Art Nouveau Gold, Platinum, Enamel, Plique-a-Jour Enamel, Pearl and Diamond Pendant-Brooch, circa 1900