The polished blue bi-directional rotating bezel is compelete having a dazzling orange GMT scale and helium-escape valve at ten o'clock on the case. Its fantastic vivid blue glow is richer and longer-lasting as compared to the eco-friendly glow of Tremendous-LumiNova. Diamond is recognised as the toughest content on the planet, https://www.watchesworld.com/top-10-dive-watches/