It consists of the melting with the raw substance working with oxyhydrogen flame plus the crystallisation in the melted droplets to kind a cylinder. Graded 9 around the Mohs-hardness scale (graded 1-ten), the resulting sapphire crystals are almost scratch-proof and very tricky, guaranteeing an unhindered eyesight constantly. Its outstanding shiny https://www.watchesworld.com/top-10-dive-watches/