An emerald and diamond ring, by David Webb. Photo Christie's Image Ltd 2014 Of bombé design, set with an oval cabochon emerald, within a tapered baguette and circular-cut diamond surround, mounted in platinum. Signed David Webb, no. AA862. Estimate $20,000...

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...

Emerald and pink sapphire ring, Michele della Valle Set with an oval cabochon emerald weighing approximately 44.65 carats, framed by numerous pavé-set round pink sapphires weighing approximately 18.30 carats, mounted in 18 karat pink gold, size 6½, maker's...

An 19.00 carats oval cabochon emerald and diamond cluster ring The oval cabochon emerald, within a brilliant-cut diamond surround, to a reeded hoop with tapered shoulders, emerald approximately 19.00 carats, diamonds approximately 1.50 carats total, signed...