TiC Is actually a sort of really challenging ceramic, and it may even be more scratch-resistant than sapphire which has a Mohs hardness score nearly 9.5. The bezel is usually topped with sapphire, giving as much defense as possible to the micro gasoline tubes that kind the markers. 1844: Adolphe https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/