What is the density of diamond?
2.7 g/cm3
3.5 g/cm3
5.5 g/cm3
8.9 g/cm3
Diamond has a very high density, with a value of 8.9 g/cm3. This is due to the close packing of carbon atoms in the crystal lattice, as well as the high atomic weight of carbon.
Diamond has the highest hardness and thermal conductivity of any natural material, properties that are used in major industrial applications such as cutting and polishing tools. They are also the reason that diamond anvil cells can subject materials to pressures found deep in the Earth.