Cartier Ballon Bleu de Cartier 36mm 18ct Yellow Gold Diamond Bezel Watch WJBB0070. 18ct yellow gold 36mm case and diamond set bezel. cabachon sapphire crown all on an 18ct yellow gold bracelet. This ladies watch has a silvered guilloche dial with blued steel hands and black numerals. Water resistant up to 30m and sapphire crystal glass. Automatic movement.