A pair of fine natural pearl and diamond earrings. Estimate CHF410,000 – CHF460,000 ($418,456 - $469,488). Photo Christie's Image Ltd 2015

Each button-shaped natural pearl, measuring approximately 12.86-13.08 x 10.82 and 12.90-12.92 x 11.19 mm respectively, within a round brilliant-cut diamond surround, 2.0 cm, mounted in platinum

Accompanied by reports no. 65516 dated 23 October 2012 and no. 61276 dated 16 January 2012 from the SSEF Swiss Gemmological Institute stating that both pearls are natural saltwater pearls.
Twenty reports dated 2013 to 2015 from the GIA Gemological Institute of America stating that 20 diamonds are all D colour, VVS2 clarity. 

Christie's. GENEVA MAGNIFICENT JEWELS, 10 November 2015, Geneva