It entails the melting on the raw compound employing oxyhydrogen flame and the crystallisation with the melted droplets to kind a cylinder. Graded 9 within the Mohs-hardness scale (graded one-ten), the resulting sapphire crystals are nearly scratch-evidence and really difficult, making sure an unhindered vision all of the time. Ensure https://www.watchesworld.com/top-10-dive-watches/