Antique Art Nouveau Whiteside & Blank Blue Enamel Guilloche 14k Gold Chain Locket Pendant

This exquisite antique round locket pendant with a 22 inch chain features a masterful Art Nouveau design with guilloche detailing, crafted in 14k yellow gold with blue and white enamel accents and completed with a bezel-set old mine-cut diamond of an estimated 0.10 carats. Made in United States circa 1900s by Henry Blank & Co., who were manufacturers for Neiman Marcus and Tiffany & Co., founded in 1890 as Whiteside & Blank and were one of few jewelers to offer Plique-à-Jour and Guilloche enameling.