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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.

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

A retro ruby, diamond and platinum brooch, circa 1945  of openwork design, with two interlocking scalloped square links, one set with calibré-cut rubies, the other with round brilliant-cut diamonds; estimated total diamond weight: 1.20 carats; estimated total ruby weight: 1.20 carats.

A retro ruby, diamond and platinum brooch, circa 1945 of openwork design, with two interlocking scalloped square links, one set with calibré-cut rubies, the other with round brilliant-cut diamonds; estimated total diamond weight: 1.20 carats; estimated total ruby weight: 1.20 carats.

RENE BOIVIN Lapel clip in platinum and white gold, set with openwork crest of brilliant-cut diamonds accented with baguette diamonds and a ...

RENE BOIVIN Lapel clip in platinum and white gold, set with openwork crest of brilliant-cut diamonds accented with baguette diamonds and a ...

A diamond and sapphire brooch  the cascade style brooch, channel-set with baguette-cut diamonds, terminating with pear-shaped sapphires; estimated total diamond weight: 6.50 carats; mounted in platinum; length: 2 1/4in.

A diamond and sapphire brooch the cascade style brooch, channel-set with baguette-cut diamonds, terminating with pear-shaped sapphires; estimated total diamond weight: 6.50 carats; mounted in platinum; length: 2 1/4in.

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.

Ruby and diamond ring, René Boivin, 1970s.     Of floral design, set with a cabochon ruby and brilliant-cut diamonds, size 51, signed R. Boivin, French assay and maker’s marks.    Sotheby’s.

Ruby and diamond ring, René Boivin, 1970s. Of floral design, set with a cabochon ruby and brilliant-cut diamonds, size 51, signed R. Boivin, French assay and maker’s marks. Sotheby’s.

A diamond and platinum brooch, circa 1950's  the spray brooch set throughout with round brilliant and single-cut diamonds; estimated total diamond weight: 4.50 carats.

A diamond and platinum brooch, circa 1950's the spray brooch set throughout with round brilliant and single-cut diamonds; estimated total diamond weight: 4.50 carats.

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