Lot 473. 18 Karat White Gold, Carved Sapphire and Diamond Ring, Michele della Valle. Estimate 5,000 — 7,000. Lot sold 10,625 USD. Photo Sotheby's
Of foliate design, set with a carved sapphire with a floral motif on the reverse, accented by pavé-set diamonds, size 6¼, signed MdV, numbered 11510.
Sotheby's. Fine Jewels, New York, 09 Dec 2016