image: Eclogitic diamond from the Orapa kimberlite, Botswana, photographed under cathodoluminescence, displays a homogeneous blue core surrounded by finely banded diamond growth. The colors are likely caused by N-related crystallographic features. Field of view 0.9 mm. This image relates to an article that appeared in the July 22, 2011, issue of Science, published by AAAS. The study, by Dr. Steven Shirey of Carnegie Institution of Washington in Washington, DC, and colleagues was titled, "Start of the Wilson Cycle at 3 Ga Shown by Diamonds from Subcontinental Mantle." view more
Credit: Photo courtesy of Steven B. Shirey, Carnegie Institution of Washington