A Late 19th Century Sapphire and Diamond Tiara Necklace. Photo Christie's Image Ltd 2013

Composed of a series of old-cut diamond-set graduated foliate motifs, with single-stone bud accents, raised on a scrolling rose-cut diamond border with cushion shaped mixed-cut sapphire highlights, mounted in silver and gold, circa 1890, 6.8cm maximum height, transforming to a necklace, with screw driver and fitted case. Signed G. Confalonieri, Milano.Roma. Estimate $68,490 - $83,710

Christie's. JEWELLERY. 5 June 2013. London, King Street