We also see irony if we think about how Monsieur Lantin spoke to her about the jewels. Remember the line when he said, “You have bohemian tastes, my dear.”?
What about this statement makes it an example of irony?
He is speaking to her as if he knows more than she does, when in fact, she is more knowledgeable about wealth than him.
He is treating her as if she is a simple little girl who can’t think for herself.
He respects her for not wanting to be upper class.
He thinks that she is a terrible person for liking false jewels, but in fact she is a wonderful person.