STANLEY: And diamonds! A crown for an empress!
STELLA: A rhinestone tiara she wore to a costume ball.
STANLEY: What’s rhinestone?
STELLA: Next door to glass.
– Tennessee Williams
A Streetcar Named Desire, Scene 2. We see the class divide reflected in Stanley’s ignorance about Blanche’s outfits and accessories. Showing his lack of education he thinks that rhinestone is real diamond, until Stella tells him it is as worthless as glass.