A French Art Deco platinum diamond chain ring with a rare colour change Ceylon sapphire.

A French Art Deco platinum diamond chain ring with a rare colour change Ceylon sapphire. Flexible ring band prong set with an oval Ceylon sapphire of ca. 5.65 ct (10.65 x 8.40 x 7.36 mm, blue-violet colour) flanked on either side by two cushion shaped old-cut diamonds (in total ca. 1 ct, J/K, vs-si). Hallmarks: Parisian platinum guarantee "tête de chien", "Cartier Paris", maker's mark "RD", faintly numbered L0059. The sapphire with signs of wear and chips to the girdle. Ring size 53. Weight 17.30 g. Cartier, Paris, ca. 1935/40.

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Ringstorlek 16,9 mm (EU 53) · vikt 17,3 g