Cartier 1999 18k Yellow Gold Chalcedony Ring R541 RODUCT DETAILS Designer: Cartier Stones & Gems: Large 14 x 5mm Oval Chalcedony Total Item Weight: 18.8 grams Size: 6.75 US (54) Measurements: band 8.85mm Hallmarks, Stamps or Metal Test: Cartier 18k 54 and serial number