TiC Is really a sort of very tricky ceramic, and it can even be extra scratch-resistant than sapphire using a Mohs hardness rating nearly 9.5. The bezel can be topped with sapphire, supplying as much defense as you can into the micro fuel tubes that type the markers. Chopard's Mille https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/