It consists of the melting from the raw compound employing oxyhydrogen flame along with the crystallisation in the melted droplets to form a cylinder. Graded nine about the Mohs-hardness scale (graded one-ten), the resulting sapphire crystals are virtually scratch-proof and very tough, ensuring an unhindered eyesight at all times. As https://www.watchesworld.com/the-most-coveted-watches-in-the-uk/