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Art Deco Platinum, Diamond and Black Onyx Bow Brooch  The fancy-shaped pierced stylized bow centering one old European-cut diamond approximately .85 ct., within looping ribbons edged by black onyx, set throughout with 134 old European and single-cut diamonds approximately 4.20 cts., with French import marks, circa 1920, approximately 12 dwt.

Art Deco Platinum, Diamond and Black Onyx Bow Brooch The fancy-shaped pierced stylized bow centering one old European-cut diamond approximately .85 ct., within looping ribbons edged by black onyx, set throughout with 134 old European and single-cut diamonds approximately 4.20 cts., with French import marks, circa 1920, approximately 12 dwt.

ART DECO DIAMOND BROOCH & RING, 1930s.  The brooch of openwork geometric design, set throughout with circular-cut diamonds, accompanied by a ring bezel-set to the centre with a similarly-cut stone,  all mounted in platinum.  The central diamond on the brooch & the diamond on the ring can both be detached & set on accompanied ring fitting. Further accompanied by a black cord & its diamond-set hook allowing the brooch to be worn as a pendant.

ART DECO DIAMOND BROOCH & RING, 1930s. The brooch of openwork geometric design, set throughout with circular-cut diamonds, accompanied by a ring bezel-set to the centre with a similarly-cut stone, all mounted in platinum. The central diamond on the brooch & the diamond on the ring can both be detached & set on accompanied ring fitting. Further accompanied by a black cord & its diamond-set hook allowing the brooch to be worn as a pendant.

A diamond brooch, circa 1945  the spray designed as a baguette and circular-cut diamond ribbon; estimated total diamond weight: 13.05 carats; mounted in platinum; length: 2 1/4in.

A diamond brooch, circa 1945 the spray designed as a baguette and circular-cut diamond ribbon; estimated total diamond weight: 13.05 carats; mounted in platinum; length: 2 1/4in.

Diamond and Emerald Brooch, Circa 1920 The openwork plaque of quatrefoil shape set in the center with an old European-cut diamond weighing approximately .75 carat, completed by 118 smaller old European-cut and single-cut diamonds weighing approximately 3.25 carats, decorated further with a circle of calibré-cut emeralds, mounted in platinum.

Diamond and Emerald Brooch, Circa 1920 The openwork plaque of quatrefoil shape set in the center with an old European-cut diamond weighing approximately .75 carat, completed by 118 smaller old European-cut and single-cut diamonds weighing approximately 3.25 carats, decorated further with a circle of calibré-cut emeralds, mounted in platinum.

A COLORED DIAMOND, DIAMOND AND EMERALD BROOCH - Set with a marquise-cut fancy intense yellow diamond, weighing approximately 3.21 carats, within a circular-cut emerald surround, to the circular and baguette-cut diamond scrolling plaque, mounted in platinum and 18k gold.

A COLORED DIAMOND, DIAMOND AND EMERALD BROOCH - Set with a marquise-cut fancy intense yellow diamond, weighing approximately 3.21 carats, within a circular-cut emerald surround, to the circular and baguette-cut diamond scrolling plaque, mounted in platinum and 18k gold.

Art Deco Platinum, Cabochon Sapphire, Diamond and Black Onyx Brooch   The modified rectangular openwork brooch highlighted by 16 buff-topped cabochon sapphires, decorated with numerous small old European-cut diamonds, accented by a stylized key-fret motif set with calibre-cut buff-topped black onyx, with French assay mark, circa 1920, approximately 7.8 dwt.

Art Deco Platinum, Cabochon Sapphire, Diamond and Black Onyx Brooch The modified rectangular openwork brooch highlighted by 16 buff-topped cabochon sapphires, decorated with numerous small old European-cut diamonds, accented by a stylized key-fret motif set with calibre-cut buff-topped black onyx, with French assay mark, circa 1920, approximately 7.8 dwt.

SAPPHIRE AND DIAMOND BROOCH, TIFFANY & CO.   Of foliage design, set with three cushion-shaped sapphires together weighing approximately 7.12 carats, to a background set with brilliant-cut and baguette diamonds together weighing approximately 7.00 carats, mounted in platinum, signed.

SAPPHIRE AND DIAMOND BROOCH, TIFFANY & CO. Of foliage design, set with three cushion-shaped sapphires together weighing approximately 7.12 carats, to a background set with brilliant-cut and baguette diamonds together weighing approximately 7.00 carats, mounted in platinum, signed.

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