It consists of the melting with the raw substance using oxyhydrogen flame and also the crystallisation of the melted droplets to form a cylinder. Graded nine about the Mohs-hardness scale (graded 1-10), the ensuing sapphire crystals are virtually scratch-proof and very tricky, guaranteeing an unhindered eyesight at all times. We https://www.watchesworld.com/the-most-coveted-watches-in-the-uk/