A real diamond is a precious gemstone made of carbon atoms arranged in a crystal structure. This unique arrangement gives diamonds their exceptional hardness, making them the hardest natural material on Earth. Diamonds are often used in jewelry and are valued for their brilliance and clarity. Diamonds are formed deep within the Earth's mantle under high pressure and temperature over millions of years. They are mined from various locations around the world, including South Africa, Russia, and Australia. The value of a diamond is determined by the "Four Cs": cut, color, clarity, and carat weight.