Lot 376. Important 19.53 carats type IIa diamond ring, M. Gérard. Estimate 1,310,000 — 1,910,000 CHF. Photo: Sotheby's.

Set with a marquise-shaped diamond weighing 19.53 carats, between pear-shaped diamond shoulders, size 511/2, sizing band, signed M. Gérard, numbered, French assay and maker's marks.  

Accompanied by GIA report no. 2183179826, stating that the diamond is D Colour, VVS2 Clarity, together with a working diagram stating that the diamond may be internally flawless after minor repolishing, and a type IIa classification letter.