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Sapphire and diamond brooch, Aletto Brothers. photo Sotheby's

Designed as a stylised flower, the petals set with calibré-cut sapphires in a concealed setting, the pistil, leaf and stem set with brilliant-cut and baguette diamonds, signed Aletto Bros. Est. 10,000—12,000 GBP. Lot Sold 15,000 GBP

Sotheby's. Fine Jewels, 14 Dec 10, London www.sothebys.com