'Black Diamond' iPhone 5 worth $15 million

You can get a new iPhone 5 for as little as $200 with a contract, or up to $850 for the top model on Apple's website.

But a Hong Kong businessman may own the world's most expensive smart-phone -- the "Black Diamond iPhone 5."

It's a diamond-and-gold-encrusted handset that includes a hidden 26-carat black diamond.

The London jeweler commissioned to make the phone estimates its value at $15 million.

It includes 600 "flawless" white diamonds, solid gold dressing, and an Apple logo made up of 53 diamonds.

The "home" button on the front is made of black diamond -- an incredibly rare gem that had been in the phone owner's family for generations.