The polished blue bi-directional rotating bezel is compelete having a shiny orange GMT scale and helium-escape valve at 10 o'clock on the case. It includes the melting of the raw compound using oxyhydrogen flame and the crystallisation of the melted droplets to kind a cylinder. Graded 9 about the Mohs-hardness https://www.watchesworld.com/top-10-dive-watches/