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A diamond brooch, René Boivin, French, circa 1937  designed as an openwork plume detailed with round brilliant-cut diamonds; with maker's mark for René Boivin, with French assay marks, with signed box; estimated total diamond weight: 2.30 carats; mounted in platinum; length: 2in.

A diamond brooch, René Boivin, French, circa 1937 designed as an openwork plume detailed with round brilliant-cut diamonds; with maker's mark for René Boivin, with French assay marks, with signed box; estimated total diamond weight: 2.30 carats; mounted in platinum; length: 2in.

PLATINUM AND DIAMOND 'PLUME' BROOCH, STERLÉ, CIRCA 1950.  Designed as a curved feather set with marquise-shaped diamonds weighing approximately 17.70 carats, the rib and bottom set with baguette diamonds weighing approximately 4.30 carats, unsigned, attributed to Sterlé, numbered 8707, French assay marks.

PLATINUM AND DIAMOND 'PLUME' BROOCH, STERLÉ, CIRCA 1950. Designed as a curved feather set with marquise-shaped diamonds weighing approximately 17.70 carats, the rib and bottom set with baguette diamonds weighing approximately 4.30 carats, unsigned, attributed to Sterlé, numbered 8707, French assay marks.

Diamond brooch/ hair pin. France, ca. 1880s, set en tremblant, old European cut , rose cut diamonds, silver, 18k gold, can be worn as two type of brooches, a hair pin, 4 × 7,5cm, 21,5g, with original case

Diamond brooch/ hair pin. France, ca. 1880s, set en tremblant, old European cut , rose cut diamonds, silver, 18k gold, can be worn as two type of brooches, a hair pin, 4 × 7,5cm, 21,5g, with original case

A stylized bird and flower brooch, 1960's.

A stylized bird and flower brooch, 1960's.

Platinum and diamond stylised tree in container or tub, the diamonds of different cuts - round, baguette, half moon etc. C. 1929, Mauboussin.

Platinum and diamond stylised tree in container or tub, the diamonds of different cuts - round, baguette, half moon etc. C. 1929, Mauboussin.

A brilliant cut diamond, tot. app 9 cts, and emerald brooch, 1970's.  18k white gold. Quality app. G-H/VVS-VS. French controlmarks. The emerald part is detachable. Diam. 5,5 cm.

A brilliant cut diamond, tot. app 9 cts, and emerald brooch, 1970's. 18k white gold. Quality app. G-H/VVS-VS. French controlmarks. The emerald part is detachable. Diam. 5,5 cm.

STELLA McCARTNEY

STELLA McCARTNEY

An art deco diamond clip, French, René Boivin, circa 1925. Designed as a pavé-set diamond plaque of geometric design, accented by old mine-cut diamonds; with maker's mark for René Boivin and French assay mark; estimated total diamond weight: 4.40 carats; mounted in platinum and eighteen karat white gold; length: 1 3/8in.

An art deco diamond clip, French, René Boivin, circa 1925. Designed as a pavé-set diamond plaque of geometric design, accented by old mine-cut diamonds; with maker's mark for René Boivin and French assay mark; estimated total diamond weight: 4.40 carats; mounted in platinum and eighteen karat white gold; length: 1 3/8in.

A diamond double-clip brooch, French, circa 1950  Each opposing openwork clip formed of scrolled ribbons set throughout with single, baguette and old round brilliant-cut diamonds, length of each clip 42mm, French control marks for 18ct gold and platinum, the diamonds estimated to weigh approximately 7.80cts in total

A diamond double-clip brooch, French, circa 1950 Each opposing openwork clip formed of scrolled ribbons set throughout with single, baguette and old round brilliant-cut diamonds, length of each clip 42mm, French control marks for 18ct gold and platinum, the diamonds estimated to weigh approximately 7.80cts in total

Platinum and Diamond ‘Ecaille’ Brooch by Rene Boivin. The pierced oval brooch of fish scale motif, set throughout with 35 old-mine and old European-cut diamonds approximately 4.25 cts., accented by single-cut diamonds, with maker’s mark, slightly obscured, and French assay marks, circa 1925, approximately 9.8 dwts.

Platinum and Diamond ‘Ecaille’ Brooch by Rene Boivin. The pierced oval brooch of fish scale motif, set throughout with 35 old-mine and old European-cut diamonds approximately 4.25 cts., accented by single-cut diamonds, with maker’s mark, slightly obscured, and French assay marks, circa 1925, approximately 9.8 dwts.

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