TiC Is usually a method of incredibly challenging ceramic, and it may even be far more scratch-resistant than sapphire using a Mohs hardness score nearly 9.5. The bezel is usually topped with sapphire, supplying as much defense as possible for the micro fuel tubes that sort the markers. Chopard's Mille https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/