Lot 519. From the Estate of Carroll Petrie. A diamond and emerald necklace, by David Webb. Estimate: $60,000 – $80,000. Photo Christie's Image Ltd 2015

Designed as three strands of fluted oval emerald beads, separated by circular-cut diamond stepped rondelle spacers, centering upon a circular-cut diamond open oval ring pendant and circular-cut diamond clasp, 15 1/4 ins., mounted in platinum and 18k white gold. Signed David Webb

The length of the shortest strand measures approximately 14 ins., the length of the longest strand measures approximately 16 3/4 ins. and 18 additional beads accompany the necklace.

Note: The center element of this necklace is now mounted in a brooch, Lot 521

Christie's. MAGNIFICENT JEWELS, 10 December 2015, New York, Rockefeller Plaza