Emerald, diamond, onyx and sapphire pendant-necklace, Mauboussin, circa 1925.

The pendant set with a cushion-shaped emerald weighing 25.50 carats, framed by calibré-cut emeralds and old European-cut, pear-shaped, marquise-shaped and baguette diamonds, anchored by 2 articulated fringes set with emerald-cut and baguette diamonds, calibré-cut emeralds and onyx segments, accented with old European-cut diamonds, sapphires and emeralds, total diamond weight approx 13.95 carats. Via Sotheby’s.

Marlene Dietrich's Trabert & Hoeffer-Mauboussin emerald and diamond bracelet. Via Pinterest

Mauboussin. A Tutti-Frutti Gem-Set Lapel Watch.

Designed as a carved ruby and circular-cut diamond surmount embellished with onyx and emerald accents, suspending an articulated line of graduated carved emeralds within an openwork diamond-set foliate motif accented with cabochon rubies, to a carved emerald depicting a bird within a black enamel and diamond surround, turning to reveal the rectangular-shaped watch case. Via 1stdibs.

An art deco diamond, gem-set and enamel bracelet, Mauboussin, French, circa 1930.

designed as three lozenge-shaped panels centering carved sapphire and ruby leaves and an emerald bead, accentuated with old European and baguette-cut diamonds and black enamel detail, each with openwork oval-shaped spacers of baguette and old European-cut diamonds; signed Mauboussin, with French assay marks and maker’s mark; estimated total diamond weight: 13.90 carats; mounted in platinum. Via Bonhams

PLATINUM, DIAMOND AND COLORED STONE 'TAJ MAHAL' BROOCH, MAUBOUSSIN, PARIS, CIRCA 1925. Via Sotheby's

Gem-set, enamel and diamond brooch, Mauboussin, Paris, 1929. Via Sotheby's.

AN ART DECO SAPPHIRE, DIAMOND AND ONYX NECKLACE, BY MAUBOUSSIN.

The cabochon star sapphire, weighing approximately 86.53 carats, suspended from a diamond, black enamel, onyx ring and carved sapphire top, to the detachable diamond-set link chain, circa 1926, chain 50.0 cm, pendant 7.6 cm, with French assay mark for platinum. Signed Mauboussin France. Via Pinterest

Art Deco aquamarine and diamond necklace, Trabert and Hoeffer-Mauboussin, 1930's. Photo Sotheby's

Set with a step-cut aquamarine, with baguette diamond detail to a necklace set with circular- and single-cut diamonds, length approximately 515mm, signed T&HM, later chain signed Cartier, French assay marks. Estimate 37,000 — 55,000. Lot Sold: 68,500 CHF

Sotheby's. Magnificent Jewels and Noble Jewels. Geneva | 14 May 2012 - www.sothebys.com