From one of my favorite movies, Beautiful Girls (1996):
Kev: It’s a trend in diamonds. Champagne. It’s a nice stone.
Willie Conway: Yeah, no, I heard about this. It’s a new trend in the diamond trade, they’re trying to create a new market.
Tommy: Oh, right, right. yeah. They were callin’ ’em “piss”, but they weren’t moving any units. What’s with you, man?
Paul Kirkwood: What?
Tommy: Well, how much you pay for this brown rock?
Paul Kirkwood: What difference does it make?
Tommy: Diamonds are supposed to be colorless! You go out and buy a colored diamond for a girl you’re not even seeing, man, you must be eating retard sandwiches again.