Solution:

Diamond is utilized as a rough

Carbon is sp3 hybridized in Diamond. With the assistance of solid covalent bonds, every carbon molecule is bound to four other carbon iotas. These covalent bonds exist all around the surface, giving it an exceptionally inflexible 3-D design. This lengthy covalent holding is exceptionally difficult to break and thus, jewel is the hardest known substance. It is consequently utilized as a grating and for cutting instruments.