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A diamond and ruby flower brooch, by Oscar Heyman & Brothers. Photo: Christie's Images Ltd 2014

Designed as a flower blossom with circular-cut ruby and diamond petals, to the baguette-cut diamond stem and marquise-cut diamond leaves, mounted in platinum. Estimate: $6,000 – $8,000

With maker's mark for Oscar Heyman & Brothers, no. 71118

Christie's. MAGNIFICENT JEWELS, 16 April 2014, New York, Rockefeller Plaza - www.christies.com