This spectacular David Webb emerald and diamond necklace is one of a kind and authenticated by David Webb. Set with four graduated rows of emerald beads, interspersed by pave-set open work panels with round brilliant-cut diamonds, further enhanced by similarly cut diamond-set rondelles. Total emerald weight is approximately 460 carats. Estimated total diamond weight is 11.30 carats. Mounted in platinum and 18k gold. Length is 20.25 inches. Signed, David Webb.