3. Rare Blue Diamond Sells for World Record Price of $8.9 Million

We all know that diamonds are a girl’s best friend, but it turns out that some girls have much more expensive taste in friends than other girls. The awesome blue diamond pictured above is a 13.39 carat beauty that sold for the record price of $8.9 million at a sale at Christie’s in Geneva last year. The diamond is considered quite rare and contains boron, giving it a slightly bluish color as well as giving it properties that make it a semi-conductor that conducts electricity. My grandfather would say that it had better do more than conduct some electricity - for that price you would expect at least bolts of lightning.