Adamas, commonly known as diamond, is a precious gemstone composed of carbon atoms arranged in a crystal structure. It is renowned for its exceptional hardness, making it the hardest natural material on Earth. Diamonds are often used in jewelry and industrial applications due to their brilliance and durability. The term "adamas" originates from the Greek word meaning "unconquerable" or "invincible." Diamonds are formed deep within the Earth's mantle under high pressure and temperature over millions of years. They are often associated with luxury and are a popular choice for engagement rings and other significant jewelry pieces.