Lot 33 – An art nouveau enamel and diamond maple leaf brooch, circa 1900. Photo Bonhams

Set with plique-à-jour enamel ranging from green at the centre to brownish orange at the tips, the veins and border millegrain-set with rose-cut diamonds, mounted in platinum and gold, French assay mark, detachable brooch fitting, pendant loops on reverse, length 4.7cm. Estimate:  $7,800 – $11,000

Bonhams. Fine Jewellery. London, New Bond Street. 18 Sep 2013 - www.bonhams.com