The mineral known for its hardness and is often a gemstone is diamond. Diamond is rated as the hardest natural material on the Mohs scale, with a hardness of 10. Formed deep within the Earth under extreme pressure and temperature, diamonds are made of carbon atoms bonded in a crystal lattice structure. Their remarkable hardness and brilliance make them highly coveted for use in jewelry, especially engagement rings. Beyond aesthetics, diamonds are also utilized in various industrial applications, such as cutting, grinding, and drilling tools due to their durability.