The element primarily found in diamonds is carbon. In a diamond's structure, each carbon atom is covalently bonded to four other carbon atoms, forming a strong and rigid three-dimensional framework. This arrangement not only contributes to the remarkable hardness of diamonds but also results in their stunning optical properties, making them highly sought after in both industrial applications and the jewelry industry. The carbon in diamonds is usually formed through high-pressure and high-temperature conditions deep within the Earth, or can even be synthesized artificially for various uses.