Both types of diamonds are made of a single element: carbon. On average, a diamond is typically 99.95% pure carbon. The other 0.05% can include one or more trace elements, or impurities, which are atoms that aren’t part of the diamond’s essential chemistry. In nature, less than 2% of the world’s mined diamonds are almost or entirely devoid of impurities. These extremely rare flawless or internally flawless diamonds are very valuable and expensive. Because of the controlled methods used to make them, all white and pink lab-grown diamonds fall into this category.