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A diamond plaque brooch, circa 1925Photo Bonhams

Of geometric design, pierced and millegrain-set throughout with single, old brilliant, square and baguette-cut diamonds, suspending a similarly set rectangular plaque and graduated baguette-cut diamond drops, principal diamonds approximately 1.00 carat each, remaining diamonds approximately 12.75 carats total, length 5.6cm. Estimate: £11,000 - 13,000, US$ 18,000 - 21,000 - Unsold

 BonhamsFine Jewellery, 25 Apr 2012. London, New Bond Street www.bonhams.com