An amethyst, emerald and diamond necklace, David Webb. Photo Bonhams

designed as a series of stylized panels, each centering an oval cabochon amethyst and accentuated by round brilliant-cut diamonds, joined by oval cabochon emerald twin-row spacers; signed Webb for David Webb, with signed pouch; estimated total diamond weight: 1.15 carats; gross weight
approximately: 178.6 grams; eighteen karat gold and platinum; length: 15 1/2in. Sold for US$20,000

Bonhams. Fine Jewelry, 13 Dec 2011. New York, California, Los Angeles and California, San Francisco www.bonhams.com