Cool blue hot rock

It's only 15.1 carats, but it's virtually flawless, and it's blue.  It's a diamond, called the De Beers Cullinan Blue, and it just sold for 39 million pounds sterling, or about $50 million U.S. dollars.

Simply dazzling! Stunning 15ct blue diamond becomes the most expensive ever sold at auction after fetching £39MILLION at Sotheby's in Hong Kong

This video shows off the gem (and you should watch it full-screen).