gold ring with ruby and diamond

An 18 carat white gold dome ring flush set with a cabochon cut ruby (app. 1.40 carat, 7.3 x 5.7 x 3.1 mm, fillings) with on both sides a brilliant cut diamond (2x appr. 0.10 carat, G-H, vvs) all flush set, signed and numbered: Cartier, number indictinct, circa 1980-1990.
weight: 5.94 grams
ring size: 14 mm. / 3 US
width: 7.1 – 2.5 mm.