It consists of the melting on the raw material using oxyhydrogen flame as well as crystallisation with the melted droplets to variety a cylinder. Graded 9 to the Mohs-hardness scale (graded one-10), the ensuing sapphire crystals are virtually scratch-evidence and very challenging, making sure an unhindered vision always. Most orders https://www.watchesworld.com/top-10-dive-watches/