In organic chemistry, main focus is the carbon based material. Carbon is central<building> block of all living organisms; however nonliving things like plastic ,medicine(this r man made) are made from carbon element. Diamonds are the pure carbon atoms in a crystal structure. Diamonds are so hard it is used in industry for cutting the hard materiel because the atoms of carbon are so closely bonded together in the crystal form(one of strongest materiel found in nature).
In the modern days v use to build the carbon based structure(layer of carbon) which is stronger and lighter than steel.