Lot 478. Pair of fine natural pearl and diamond pendent ear clips, Petochi. Estimation 245,000 — 340,000 CHF. Lot sold 3,010,000 CHF. Photo Sotheby's. 

Each set with a button shaped natural pearl measuring approximately 13.65 x 13.70 x 12.10mm and 13.40 x 13.50 x 12.45mm, suspending a detachable pendent set with a drop shaped natural pearl measuring 11.75 x 12.95 x 21.00 and 11.45mm x 12.55 x 20.05mm, from a single-cut diamond embellished cap and circular-cut and marquise-shaped diamonds, one signed G. Petochi, the other inscribed Roma, both with maker's marks for Petochi. 

Accompanied by SSEF report no. 78649, stating that the four pearls were found to be natural, saltwater.