When ceramics are mentioned in the context of watches, one does not of course think of clay pots but of zirconium dioxide sintered at very high temperatures. major uses are body implants, watchcases, bracelets and perpetually sharp kitchen knives. The lamda sensor that optimizes fuel combustion in car engines is also made of zirconium oxide. Hublot uses high-tech ceramics for the case and the bezel of certain models. Is very hard and strong. more exotic applications are camshafts, brake discs of extreme sports cars and Formula 1 racing cars. Pure zirconium oxide ceramic is white and translucent, but may be colored black, yellow, blue or Bordeaux-red by mixing in complex mixtures of metal oxides.