STANLEY: And come up with that – gorgeous – diamond – tiara?
BLANCHE: This old relic? Ha-ha! It’s only rhinestones.
STANLEY: Gosh. I thought it was Tiffany diamonds.
– Tennessee Williams
A Streetcar Named Desire, Scene 10. When Blanche speaks of finding something to wear for her tropical Caribbean cruise, Stanley toys with her. He uses irony to suggest her diamond tiara, knowing that they’re not real diamonds, having been told earlier by Stella they were rhinestones.