A natural pearl ring. Photo Christie's Image Ltd 2014.

Set with a button-shaped natural pearl, measuring approximately 13.2-13.2 x 10.50 mm, to the tapered baguette-cut diamond shoulders, mounted in platinum, ring size 6½. Estimate CHF30,000 – CHF50,000 ($34,216 - $57,027)

Accompanied by report no. 73083 dated 6 March 2014 from the SSEF Swiss Gemmological Institute stating that the pearl is a natural saltwater pearl

Christie's. GENEVA MAGNIFICENT JEWELS, 14 May 2014, Geneva - http://www.christies.com/