By TLex Constructed from high-tech ceramic. The J12 Marine Diver is water-resistant to 300m. Its case is available in two color variants (black or white) , two sizes (38mm or 42mm) and come with three bezel colors (black ,blue or white) . Its sapphire crystal has been treated to anti-reflective coating. Beating away inside its ceramic case is a Swiss automatic caliber. Its bracelet is also constructed from high-tech ceramic. The J12 Marine Diver is supplied with an extra caoutchouc rubber strap in either black, white or blue.