A COLOUR-CHANGE SAPPHIRE AND DIAMOND RING

A COLOUR-CHANGE SAPPHIRE AND DIAMOND RING The old-cut cushion shaped colour-change sapphire weighing approximately 17.59 carats, claw-set, to the single-cut diamond foliate shoulders, raised on a polished hoop, ring size P-Q <i>Accompanied by report no.11663 dated 18 August 1015, from The Gem and Pearl Laboratory London, stating that the colour-change sapphire is of Ceylon origin ( Sri Lanka) with no evidence of heat treatment. The certificate states 'this sapphire appears blue in daylight and bluish purple in incandescent light'.</i>