According to Jim · S08E17
Diamonds Are a Ghoul's Best Friend
2009-06-02 · 23 min · 3.0 (1) · TMDB
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.