A pair of natural pearl and diamond ear pendants, by David Webb. Photo Christie's ImageLtd 2013

Each suspending a detachable drop-shaped natural pearl, measuring approximately 12.57 x 18.37 mm, with a marquise-cut diamond cap, to the surmount set with a natural pearl, measuring approximately 12.09 mm, within a circular-cut diamond and sculpted gold foliate surround, mounted in gold and platinum. Signed Webb for David Webb. Estimate: $100,000 – $150,000

With report 71516 dated 30 October 2013 from SSEF Swiss Gemmological Institute stating that the analysed properties confirm the authenticity of these four saltwater natural pearls 

With report 2155728567 dated 14 October 2013 from the Gemological Institute of America stating that the pearls are natural saltwater pearls. No indications of treatment 

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