Cartier Ballon Bleu 18ct Rose Gold 42mm Automatic Leather Strap Watch WGBB0030. 18ct rose gold 42mm case and bezel all on a brown alligator leather strap. This men's watch has a silvered guilloche dial with blued steel hands and black roman numerals. date display at the 3 o'clock position. Water resistant up to 30m and sapphire crystal glass. Automatic movement.