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An Art Nouveau 18 karat gold, diamond, conch pearl and plique-à-jour enamel ‘Morning Glory’ necklace, attributed to Marcus & Co., circa 1900.

Circa 1900 An Art Nouveau 18 karat gold, diamond, conch pearl and plique-à-jour enamel ‘Morning Glory’ necklace, attributed to Marcus & Co., circa The pendant set with round diamond accents culminating in plique-à-jour flower clusters with 11 conch

A PEARL, CONCH PEARL AND DIAMOND NECKLACE The collet-set diamond necklace with pearl spacers suspending a diamond line of similar design with central conch pearl and pearl drop, to the fine-link backchain, 38.6 cm. long, in green leather case,

A PEARL, CONCH PEARL AND DIAMOND NECKLACE The collet-set diamond necklace with pearl spacers suspending a diamond line of similar design with central conch pearl and pearl drop, to the fine-link backchain, cm. long, in green leather case.

A Tiffany Conch Pearl and Diamond Chrysanthemum Brooch.

Pink - Tiffany & Co. Conch and Diamond Chrysanthemum Brooch. All those years of making beautiful things and then they made this. Hopefully it looks better in real life than in the photo.

A DIAMOND AND CONCH PEARL BROOCH  The drop-shaped conch pearl pendant, enhanced by an old European-cut diamond scalloped cap, suspended by a diamond collet and old European-cut diamond foliate link, from a similarly-set pierced foliate surmount, mounted in platinum

A DIAMOND AND CONCH PEARL BROOCH The drop-shaped conch pearl pendant, enhanced by an old European-cut diamond scalloped cap, suspended by a diamond collet and old European-cut diamond foliate link, from a similarly-set pierced foliate surmount, mounted in

Antique Art Nouveau Jewelry by Tiffany.

Atlas® rings, from top: sterling silver, rose gold with diamonds and band ring in gold.

Belle Epoque Platinum, Gold, Conch Pearl and Diamond Lavaliere  Suspending one oval conch pearl approximately 9.0 x 7.5 mm., capped by diamond-set leaves, within an openwork garland motif, set throughout with old European-cut diamonds, circa 1905, completed by a delicate platinum chain. Length 16 inches. With original fitted box. Via Doyle New York.

Belle Epoque Platinum, Gold, Conch Pearl and Diamond Lavaliere Suspending one oval conch pearl an openwork garland motif, set throughout with old European-cut diamonds, circa delicate platinum chain. Doyle New York.

A CONCH PEARL AND DIAMOND PENDENT NECKLACE  Designed as a brilliant and baguette-cut diamond and conch pearl pendant and fringe, to the backchain of similar design, 41.1 cm. long

Necklace, designed as a brilliant and baguette-cut diamond and conch pearl pendant and fringe, to the backchain of similar design, cm.

The Princesse de Monaco rose brooch. Courtesy Mikimoto (America) Co., Ltd.The Princesse de Monaco rose brooch is a breathtaking work. A rare natural pink conch pearl glows in the center. Tahitian pearl buds and demantoid garnet leaves crown the piece. The workmanship is equally impressive–setting round, pear, oval, and marquise shaped pink diamonds and round white diamonds on a concave surface

Princesse de Monaco '' Rose brooch '' Courtesy Mikimoto (America) Co. The brooch is a breathtaking work. A rare natural pink conch pearl glows in the center. Tahitian pearl buds and demantoid garnet leaves crown the piece

PAIR OF CONCH PEARL AND DIAMOND PENDENT EARRINGS Each suspending three fringes of conch pearls, decorated by briolette diamonds, to a surmount set with a conch pearl, surrounded by rose-cut diamonds, the fourteen conch pearls measuring approximately 11.74 x 8.22 x 6.20mm to 5.46 x 4.76 x 4.36mm, the diamonds altogether weighing approximately 12.20 carats, mounted in 18 karat white gold.

PAIR OF CONCH PEARL AND DIAMOND PENDENT EARRINGS Each suspending three fringes of conch pearls, decorated by briolette diamonds, to a surmount set with a conch pearl, surrounded by rose-cut diamonds, the fourteen conch pearls measuring approximately

PAIR OF NATURAL PEARL, CONCH PEARL AND DIAMOND PENDENT EARRINGS    Each suspending on a drop-shaped natural pearl, surmounted by a conch pearl, decorated by brilliant-cut diamonds extending to the hook surmount, mounted in platinum.

Lot Pair of natural pearl, conch pearl and diamond pendent earrings. Photo Sotheby's Each suspending on a drop-shaped natural.

A CONCH PEARL AND DIAMOND BROOCH/PENDANT, BY HARRY WINSTON   Of foliate motif, the leaves set with old-cut diamonds, enhanced by nine conch pearls, 6.2 cm, with French assay mark for gold, in navy blue leather Harry Winston pouch  With maker's mark HW for Harry Winston

Harry Winston brooch/pendant of foliate motif, the leaves set with old-cut diamonds, enhanced by nine conch pearls, cm, with French assay mark for gold.

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