Cartier Santos de Cartier Medium Diamond Set Automatic 18ct Yellow Gold Watch WJSA0013. 18ct yellow gold 35.1mm case and diamond pave set bezel set with 206 brilliant cut diamonds (0.64ct) all on a blue leather strap and comes complete with an additional green alligator leather strap. This watch Features a silver sunray dial with blued hands and black hour numerals. Water resistant up to 100m and sapphire crystal glass. Calibre 1847 MC automatic movement.