A ruby, diamond, emerald and gold sautoir, by David Webb. Photo Christie's Image Ltd 2013 

Suspending a detachable pendant, centering upon an oval cabochon ruby within a circular-cut diamond surround, to a circular-cut diamond and emerald foliate link, from a neckchain of similarly set links alternating with cabochon rubies and circular-cut diamonds, mounted in 18k gold, 24½ ins., (two segments detach, may be also be worn as two shorter necklaces of 19 and 14 ins.). Neckchain signed David Webb (3). Estimate: $40,000 – $60,000 

Christie's. MAGNIFICENT JEWELS. 10 December 2013. New York, Rockefeller Plaza -www.christies.com