#1 iPhone 5 Black Diamond by Stuart Hughes – $15.3 Million
iPhone 5 Black Diamond, the most expensive phone in the world, was designed by Stuart Hughes for a Chinese businessman. It took him around 9 weeks to build this custom iPhone by hands. A 26-carat black diamond serves as the home button while the outside casing of the smartphone is made of 24-carat gold. The bezel and Apple logo are embellished with flawless diamonds.