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Edwardian Black Opal, Diamond, Platinum, Gold Necklace, J.E. Caldwell & Co.  The necklace features a pear-shaped black opal cabochon measuring 18.00 x 12.00 x 4.70 mm, set in gold, enhanced by European and full-cut diamonds weighing a total of approximately 0.45 carat, set in platinum, marked JEC & Co. for J.E. Caldwell & Co.

The necklace features a pear-shaped black opal cabochon measuring x x mm, set in gold, enhanced by European and full-cut diamonds weighing a total of approximately carat, set in platinum, marked JEC & Co. Caldwell & Co.

Katherine Jetter Classic Opal and Diamond Pendant | From a unique collection of vintage chain necklaces at https://www.1stdibs.com/jewelry/necklaces/chain-necklaces/

Australian Black Opal and Diamond Pendant

Katherine Jetter Lady Lavender Pendant Exquisite 75ct Lavender Boulder Opal set in 18K White Gold with White and Black Diamonds and Amethyst. 34" 18K White Gold and Moonstone chain.

Katherine Jetter Lady Lavender Pendant, Lavender Boulder Opal set in White Gold with White and Black Diamonds, Amethyst and Moonstone chain.

39.29 Carat Amethyst Diamond Platinum Pendant. A majestic 39.29-carat Siberian amethyst showcases its regal purple hue in this convertible Belle Époque pendant brooch. A wonderful foliate setting crafted of platinum and adorned with approximately 2.75 carats of shimmering white diamonds encircles the amethyst in this Edwardian-period piece.   Approximately .51 carats of white diamonds are mounted in the contemporary 18K gold chain. c 1910

39.29 Carat Amethyst Diamond Platinum Pendant

View this item and discover similar more jewelry for sale at - A majestic Siberian amethyst showcases its regal purple hue in this convertible Belle Époque pendant brooch. A wonderful foliate setting

Australian boulder opal on faceted emeralds with fixed stations of emerald…

Australian boulder opal on faceted emeralds with fixed stations of emerald baguettes, diamond marcasite, sterling silver and gold (SOLD)

AQUAMARINE AND DIAMOND PENDANT NECKLACE Of geometric design, centring on an emerald-cut aquamarine weighing approximately 50.55 carats, suspending from an articulated necklace of stylised buckle links set with baguette and circular-cut diamonds, the diamonds together weighing approximately 9.00 carats, mounted in platinum, length approximately 480mm.

AQUAMARINE AND DIAMOND PENDANT NECKLACE Of geometric design, centring on an emerald-cut aquamarine weighing approximately 50.55 carats, suspending from an articulated necklace of stylised buckle links set with baguette and circular-cut diamonds, the diamonds together weighing approximately 9.00 carats, mounted in platinum, length approximately 480mm.

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