Lot 1692. 4.40 carats Kashmir  Sapphire and Diamond Ring, Buccellati. Estimate 2,400,000 — 3,200,000 HKD (306,216 - 408,288 USD). © Sotheby's.

Designed as a pierced dome centring upon a step-cut sapphire weighing approximately 4.40 carats, embellished with single- and brilliant-cut diamonds, to the shoulders decorated with acanthus scrolls, mounted in platinum, signed Buccellati, numbered, size 6¼, case stamped Buccellati.

Accompanied by SSEF report no. 99709, dated 23 April 2018, and AGL report no.  1087351, dated 16 October 2017, both stating that the sapphire is of Kashmir origin, with no indications of heating; AGL further stating that the sapphire would be classified as Classic™ Kashmir, with no clarity enhancement.