An Art Nouveau plique-à-jour enamel, peridot, and diamond brooch, Marcus & Co., centring a circular-cut peridot within a shaped plique-à-jour enamel frame with old European-cut diamonds and suspending a drop, signed.

An Art Nouveau plique-à-jour enamel, peridot, and diamond brooch, Marcus & Co., centring a circular-cut peridot within a shaped plique-à-jour enamel frame with old European-cut diamonds and suspending a drop, signed.

An art nouveau enamel and diamond-set pendant necklace, by Riker Brothers, circa 1910 The blue and green plique-à-jour enamel oval plaque, overlaid by a textured water lily with an old brilliant-cut diamond accent, within an interlaced textured surround, to a belcher-link chain

An art nouveau enamel and diamond-set pendant necklace, by Riker Brothers, circa 1910 The blue and green plique-à-jour enamel oval plaque, overlaid by a textured water lily with an old brilliant-cut diamond accent, within an interlaced textured surround, to a belcher-link chain

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