> Diamonds are the hardest known material Diamonds are not the hardest known material. 1) Wurtzite boron nitride (w-BN) 2) Lonsdaleite 3) Aggregated carbon

> Diamonds are the hardest known material Diamonds are not the hardest known material. 1) Wurtzite boron nitride (w-BN) 2) Lonsdaleite 3) Aggregated carbon nanorods (ACNR) are all harder.