Lot 132. A magnificent 15.52 carats step-cut Type IIa diamond single-stone ring, by Harry Winston, circa 1973. Estimate £700,000 - 900,000 (€880,000 - 1.1 million). Photo Bonhams.

Accompanied by a report from GIA stating that the diamond is D colour, VVS2 clarity, potential. Report number 2175516935, dated 4 March 2016.

Accompanied by an additional letter from GIA stating that the diamond has been classified as Type IIa.

Accompanied by a report from GIA stating that the diamond is D colour, Flawless clarity. Report number NY22717. For more information please refer to department.

Bonhams. FINE JEWELLERY, 12:00 BST, LONDON, NEW BOND STREET