Lot 158. A button-shaped natural pearl and diamond ring. Estimate CHF 300,000 - CHF 500,000 (USD 302,342 - USD 503,903). Price realised CHF 883,500 (USD 896,487). © Christie's Images Ltd 2017

Set with a button-shaped natural pearl, measuring approximately 19.45-20.95x14.65 mm, on a marquise-cut diamond gallery, to the trifurcated hoop, ring size 7 ½

Accompanied by report no. 89945 dated 24 January 2017 from the SSEF Swiss Gemmological Institute stating that this pearl is a saltwater natural pearl.

Christie's. Magnificent Jewels, 17 May 2017, Geneva