Yellow Diamond (IMAGE) Harvard University Caption Imperfections in diamond can give the crystals a characteristic color. Nitrogen in these tiny diamonds (top) turns them yellow. (Microdiamond powder provided by Daniel Twitchen and the Element Six company [UK].) Some imperfections, including the nitrogen-vacancies explored in this work, are luminescent (can emit red photons one at a time) and behave as excellent optically addressable quantum memory. The chip (bottom right) consists of diamond with a silver layer on top. Credit 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.