The 11.02-carat Brazilian alexandrite at the center of this ring possesses the remarkable ability to change color. Unlike their Russian counterparts that change from green to red, those alexandrites that hail from the mines of Brazil display a stunning blue-green hue under white light and change to a rich reddish-purple when viewed under incandescent light. This brilliant-cut example is certified by GemResearch Swisslabs, the American Gemological Laboratories and the Swiss Gemmological Institute