A new process now uses hair, from the living or the dead. "We started thinking about doing a diamond from someone famous, like Elvis, but the licensing fees were enormous," said VandenBiesen.

Harrod's is having a blowout – and it's not on cubic zirconia. The U.K. department store now offers a new luxury salon service, and it'll cost you: 320 pounds ($434) for a diamond-and-truffle ...