Exploring the dark side of the ocean omega has evolved its ceramic expertise to produce the seamaster planet ocean deep black this remarkable 455 mm lifestyle timepiece is the combination of a gmt model and a diving watchthe glossy brushed casebody has been crafted from a single block of ceramic while the 18k sedna gold bezel features a ceramic bezel ring with a ceragold diving scale 18k sedna gold is used again to create the crown and helium escape valve as well as the hands and ind