A natural diamond is made from carbon and is the hardest natural known substance on earth. Natural diamonds are created over a period of one to three billion years, at least 85 miles below the earth's mantle under natural conditions of very high pressure and high temperature. Once a diamond has been created in these underground conditions, it travels via molten rock to the earth's surface, where it is mined, refined, and turned into beautiful jewelry. This item is made of diamond.