The type of covalent bonding found in a diamond is known as a network covalent bond. A network covalent bond is one where elements create large molecules that repeat the same structure. Silicates, which are found in quartz, can also form network covalent bonds.
Diamonds consist of the element carbon bonded to itself. Each carbon atom in a diamond forms four covalent bonds to four different carbon atoms by sharing one electron with each atom. This carbon bond repeats itself to create a diamond crystal, which contains millions of carbon atoms. Another example of a carbon network covalent bond is graphite. Instead of sharing one electron with each of four carbon atoms, each carbon atom in graphite shares one electron with two different carbon atoms, and two electrons with a third carbon.