Fancy color diamonds come in an astonishing array of shades, with natural forces combining in unique ways to produce nearly every hue imaginable. Just like mixing red and blue paint creates purple, various geological processes can work independently or blend together, resulting in a spectrum of colors. Learn more about pink, purple, and brown diamonds from Dr. Gabriela Farfan, the museum's Coralyn W. Whitney Curator of Gems and Minerals. | Smithsonian National Museum of Natural History