Quote from Denise in the episode Spoiler: Bert Gets Married
Stuart: No, it's where do we find red quartz? Bert: Why? Stuart: To fix the machine. I got a message. Denise: Oh, tell him how you got it. Stuart: Stop it. Bert: [points to a necklace on a guy] That's red quartz. Stuart: Great, thanks. Denise: Two times. Good for you.