CARTIER (Attributed to) RING In platinum, set with a round old-cut diamond weighing 6.76 cts, the shoulder set with small diamonds. Circa 1920. Master stamp of the Gustave Renault workshop, which worked extensively for Cartier during the Art Deco period. In a Cartier jewellery box. A diamond and platinum ring set with a round old cut diamond weighing 6.76 cts, attributed to Cartier. Circa 1920. L.F.G. certificate attesting: H colour, SI1 clarity. RC : Dimensions of the stone: 12.33 - 12.55 x 7.45 mm. Scratches on the roundel. Hallmark: a leaf, a crescent moon to the right, an R above, in a vertical lozenge. TDD: 51 - 52; US: 6 (changeable). Gross weight: 3.6 g (Pt - 950).