A sapphire and diamond ring, collet-set with a cushion-shaped sapphire weighing approximately 5.50

A sapphire and diamond ring, collet-set with a cushion-shaped sapphire weighing approximately 5.50 carats, within a border of circular-cut diamonds, mounted in platinum, size N1/2

Accompanied by report no. CDC 23081192 from C.Dunaigre Switzerland, stating that the sapphire is of Sri Lankan (Ceylon) origin, with no indications of heat treatment