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Pair of onyx and diamond earrings and a cultured pearl and diamond ring, Michele della Valle. Photo courtesy Sotheby's

The earrings each of interlocking hoop design, set with onyx and brilliant-cut diamonds, pouch; the ring centring on a swing-set cultured pearl of brownish tint, the band pavé-set with brilliant-cut diamonds, 521/2; earrings and ring each signed della Valle, maker's marks. Estimate   10,000 — 15,000 CHF

Sotheby's. Magnificent Jewels. Genève | 13 nov. 2013 - www.sothebys.com