Opal, Diamond, Platinum and Gold Brooch/Pendant by Marcus & Co. An American Art Nouveau 18 karat gold and platinum brooch/pendant with opal, diamonds and enamel by Marcus & Co. The brooch/pendant has a center cabochon black opal and 76 old mine-cut diamonds with an approximate total weight of 4.00 carats. The center opal is mounted in a scrolled setting and framed with enamel and diamonds, suspending a matched scroll set opal. Circa 1900
DORIS DUKE & HER MAGNIFICENT JEWELS AN ELEGANT DIAMOND CLIP BROOCH, BY DAVID WEBB Designed as an undulating old European and baguette-cut diamond foliate scroll, suspending a central pear-shaped diamond, weighing approximately 9.67 carats, and a smaller pear-shaped diamond, weighing approximately 4.14 carats, further enhanced by a marquise-cut diamond fringe, mounted in platinum
PLATINUM, GOLD, BLACK OPAL, DIAMOND AND ONYX PENDANT-BROOCH, CARTIER, PARIS, CIRCA 1920. Set with a square-shaped black opal measuring approximately 18.7 by 18.7 mm., supporting a pear-shaped cabochon black opal measuring approximately 24.3 by 17.1 by 9.4 mm., accented by old European-cut and single-cut diamonds weighing approximately 3.25 carats, and carved onyx segments, signed Cartier, numbered 5649B, French assay mark.
A Belle Epoque pin of an aquamarine cameo with facetted back- 4 Cupids (putti) playing the part of vintagers. Mounted as a pendant within a rose diamond mille-grain border, hanging within an open frame of floral & leafy branches with a pear shaped diamond hanging below, it is attached by chains to the trumpet shaped flower heads & the suspension loop at the top, all diamond set. Cameo: 18th century style. Pendant: 1905.