Platinum and diamond ring, Cartier. Centring a collet-set brilliant-cut diamond between diamond-set crossover shoulders, the diamonds together weighing approximately 0.90 carat, size I 1/2, signed Cartier, numbered C303777. Accompanied by a Cartier box. PROVENANCE. Important Jewels Sotheby's Australia, 23 May 2017, lot 139, illustrated. Private Collection, Sydney, acquired from the above