An art deco natural pink sapphire, diamond, rock crystal, black onyx and platinum brooch centering a cushion-shaped natural pink sapphire, set within a rock crystal quartz circle, further accented by transitional and single-cut diamonds, highlighted by black onyx.

An art deco natural pink sapphire, diamond, rock crystal, black onyx and platinum brooch centering a cushion-shaped natural pink sapphire, set within a rock crystal quartz circle, further accented by transitional and single-cut diamonds, highlighted by black onyx.

Early Art Deco openwork diamond and onyx corsage brooch, c.1920, of geometric design formed by two graduated kite motifs, millegrain set with lines of diamonds and inset with onyx sections, the smaller kite hung below on two detachable lines of articulated collet diamonds, the whole suspending a polished pear shaped onyx inset with a round brilliant cut diamond.

Early Art Deco openwork diamond and onyx corsage brooch, c.1920, of geometric design formed by two graduated kite motifs, millegrain set with lines of diamonds and inset with onyx sections, the smaller kite hung below on two detachable lines of articulated collet diamonds, the whole suspending a polished pear shaped onyx inset with a round brilliant cut diamond.

An art deco sapphire and diamond bracelet, Cartier, French, circa 1925 centering a cushion-cut sapphire, joining a slender looped line of old European and single-cut diamonds, accentuated by calibré-cut sapphires; signed Cartier Paris London New York, no. 4262, with French assay mark and maker's mark for Renault, within original fitted box; sapphire weighing approximately: 17.20 carats; estimated total diamond weight: 2.60 carats; mounted in platinum; length: 7 1/4in.

An art deco sapphire and diamond bracelet, Cartier, French, circa 1925 centering a cushion-cut sapphire, joining a slender looped line of old European and single-cut diamonds, accentuated by calibré-cut sapphires; signed Cartier Paris London New York, no. 4262, with French assay mark and maker's mark for Renault, within original fitted box; sapphire weighing approximately: 17.20 carats; estimated total diamond weight: 2.60 carats; mounted in platinum; length: 7 1/4in.

Cabochon, faceted and bead-cut Burma ruby, diamond and platinum art deco corsage brooch.

Cabochon, faceted and bead-cut Burma ruby, diamond and platinum art deco corsage brooch.

AN ART DECO ROCK CRYSTAL, DIAMOND, ONYX AND PEARL BROOCH, BY CARTIER  Designed as a rock crystal hoop with circular-cut diamond interior and pearl detail to the onyx and diamond palmette terminals, pearls untested, circa 1920, 5.6 cm wide, with French assay marks for platinum Signed Cartier, number indistinct

AN ART DECO ROCK CRYSTAL, DIAMOND, ONYX AND PEARL BROOCH, BY CARTIER Designed as a rock crystal hoop with circular-cut diamond interior and pearl detail to the onyx and diamond palmette terminals, pearls untested, circa 1920, 5.6 cm wide, with French assay marks for platinum Signed Cartier, number indistinct

BROCHE ART DECO ONYX, DIAMANTS ET CITRINES Faite d'un anneau d'onyx épaulé de deux motifs géométriques pavés de diamants et citrines, monture en or et platine, vers 1925

BROCHE ART DECO ONYX, DIAMANTS ET CITRINES Faite d'un anneau d'onyx épaulé de deux motifs géométriques pavés de diamants et citrines, monture en or et platine, vers 1925

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