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Beryl’s various coloring make it a sought-after and precious gemstone. Knowledge on the physical origin behind the various colorings is essential to differentiate artificial colorings from natural ones. The blue color of the variety aquamarine has been proposed to be due to charge transfer between adjacent Fe 3+ -Fe 2+  pairs on the Al site and its adjacent 6g interstitial position, respectively. The present work presents the first experimental confirmation of such an arrangement.

Iron pairs in beryl: New insights from electron paramagnetic resonance, synchrotron X-ray absorption spectroscopy, and ab initio calculations