Blue diamonds form 400 miles beneath the Earth's surface, research shows SCIENTISTS probing the origins of some of the world's most precious diamonds have revealed previously hidden secrets about their fiery birthplace deep underground. Share: Facebook Twitter Google+ Stumble Digg Email ThisBlogThis!Share to XShare to Facebook Related Posts:MH370 could be FOUND after scientists say they think they know ‘PRECISELY’ where it isAnimal Welfare Groups Have a New Tool: Virtual Reality400-year-old shark could hold the key to fountain of youthClimate change shock as professor says impact has been GOOD for wildlifeTrilobites: They Were Shorter and at Risk for Arthritis, but They Survived an Ice AgeEND OF WORLD WARNING: Watch biggest explosion EVER on Moon as NASA warns we could be next