According to Jim Season 8 Episode 17
Overview
It’s Cheryl’s birthday and Jim decides to buy her a diamond necklace. But in an attempt to save money, he buys the necklace from Andy’s unreliable source and soon learns that it was taken off of a dead woman whose ghost now begins to haunt him.
Episode Title: Diamonds Are a Ghoul's Best Friend
Duration: 22min
Air Date: 2009-06-02
Year: 2009
IMDb: