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.
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.
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.