A diamond is primarily made of carbon atoms. This crystalline form of carbon exhibits a remarkable arrangement of atoms, contributing to its renowned hardness and brilliance. The carbon atoms are bonded together in a tetrahedral lattice, which gives diamonds their unique optical properties. The formation of diamonds occurs deep within the Earth’s mantle, where high pressure and temperature conditions exist. While primarily composed of carbon, diamonds can also contain trace amounts of other elements, which can influence their color and characteristics, but their fundamental composition remains as pure carbon.