It consists of the melting with the raw compound using oxyhydrogen flame and the crystallisation of the melted droplets to kind a cylinder. Graded nine around the Mohs-hardness scale (graded one-ten), the ensuing sapphire crystals are pretty much scratch-proof and very hard, making certain an unhindered eyesight continually. I agree https://www.watchesworld.com/the-most-coveted-watches-in-the-uk/