Antarctica might have a new kind of ice — diamonds might exist there.
A stunning blue diamond broke a world record today, fetching a price of 6.2 million British pounds, or about $1.8 million per carat.
Diamond inclusions indicate that Earth's carbon cycle extends from the surface to the deep lower mantle.
The Pink Star diamond sold at auction in Geneva on Nov. 13, 2013, for a record $83 million. Here are more photos of the World's Rarest Gemstones.