An art deco emerald and diamond bracelet, circa 1930. photo courtesy Bonhams

Composed of five geometric plaques, connected by buckle-shaped links, pavé-set with old brilliant, brilliant, single and baguette-cut diamonds, each plaque set to the centre with a step-cut emerald, to an associated clasp, diamonds approximately 15.00 carats total, emeralds later replacements, associated clasp with possibly spurious Cartier signature and number, length 18.8cm. Estimate: £20,000 - 30,000

Bonhams. Fine Jewellery, 21 Apr 2010New Bond Street www.bonhams.com