18 Karat Two-Color Gold, Sapphire and Diamond Pendant-Necklace, Buccellati. Estimate 15,000 — 20,000 USD. Photo: Sotheby's.

The oval-shaped pendant centering a sapphire, accented by numerous rose-cut diamonds, length 15 inches, signed Gianmaria Buccellati, Italy; the pendant detaches and may be worn as a brooch.

Sotheby's. Important Jewels, New York, 24 sept. 2015