What are the fixed geometric patterns in the crystal structure are known as the diamonds?

In crystal structures, diamonds refer to a specific arrangement of carbon atoms in a tetrahedral lattice. Each carbon atom is covalently bonded to four other carbon atoms, forming a three-dimensional network that contributes to its exceptional hardness and brilliance. This arrangement is characteristic of the diamond cubic structure, which is a fixed geometric pattern that gives diamonds their unique properties. The orderly arrangement of atoms in this structure is what distinguishes diamonds from other forms of carbon, such as graphite.