Yes.
Diamond is an allotropic form of carbon.
The sole element in a diamond is carbon. Diamond is composed of carbon atoms arranged in a crystal lattice structure, making it one of the hardest known natural materials.
diamond
diamond
Diamond
The hardest naturally occurring substance is called diamond. It is a form of carbon.
Diamond is the hardest natural mineral; nothing is harder.
Carbon because of Diamond!
Diamond.
A diamond
Diamond
diamond