The cushion-shaped alexandrite, weighing 16.82 carats, within an brilliant-cut diamond surround, extending to the gallery and hoop, diamonds approximately 2.40 carats total, signed Hatik, maker's mark, ring size 6¼

Accompanied by a GRS report stating that the natural alexandrite changes from Olive-Green to Salmon-Red colour and originates from Ceylon (Sri Lanka). Report number GRS2004-040784, dated 17 April 2004. 

Bonhams. RARE JEWELS & JADEITE, 30 Nov 2016, 15:00 HKT - HONG KONG, ADMIRALTY