Yellow Diamonds (IMAGE) U.S. National Science Foundation Caption Imperfections (known as color centers) in diamond can give the crystals a characteristic color. Nitrogen in these tiny diamonds (top) turns them yellow. The chip consists of diamond with a layer of silver. Credit Photo by Eliza Grinnell / Harvard SEAS Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.