Lot 458. Exceptional platinum, 28.18 carats sapphire and diamond ring. Estimation 4,000,000 — 5,000,000 USD. Lot sold 5,093,000 USD. Photo Sotheby's

Centering a square emerald-cut sapphire weighing 28.18 carats, framed by 32 tapered baguette diamonds, size 8, the mounting by Oscar Heyman & Brothers. 

Provenance: Sotheby's New York, October 19, 1983, Magnificent Jewelry, lot 384.

Accompanied by AGL report no. CS 59661 stating that the sapphire is of Classic Kashmir origin, with no indications of heating, with an Exceptional Total Quality Integration Rating.

Accompanied by Gübelin report no. 14030082 stating that the sapphire is of Kashmir origin, with no indications of heating.

Sotheby's. Magnificent Jewels, New York | 29 avr. 2014