First used by Audemars Piguet on watches like the Royal Oak Offshore Schumacher and the Royal Oak Offshore Jarno Trulli, Cermet was first used by AP on the Jarno Trulli in 2010 and then an all three iterations of the Schumi. Cermet is a very advanced composite typically used in creating heat shields for space shuttles and its name is the result of the contraction of the words “ceramic” and “metal”. Cermet is anti-corrosive and extremely hard with a hardness rating of 2,360 Vickers.