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An art nouveau ruby and diamond cluster ring, attributed to Marcus & Co, circa 1900. Of quatrefoil design, the pear-shaped and circular-cut rubies within a chased serpentine surround with old brilliant-cut diamond detail, between pierced scrolling shoulders.

Gold, opal and enamel brooch/ pendant, Marcus & Co, circa 1900. Centring on an opal within a frame of irises decorated with green guilloché enamel, suspending a fluted drop, signed Marcus & Co.

Beautiful "Opal Series" jewelry pieces made by Marcus Co. which was established in c.1892 during the Gilded Age in NYC.

Art Nouveau 18kt Gold, Demantoid Garnet, and Pearl Pendant/Brooch, Marcus & Co.(Lot 293, Estimate $10,000-$15,000)

GOLD, OPAL AND ENAMEL SAUTOIR, MARCUS & CO. c1900. The drop-shaped black opal within a frame of gold irises accented by green enamel suspended from a multi-strand gold foxtail-link chain, slide bead and clasp with blue and green enamel, length approximately 18 inches.