The dictionary defines irony as "the use of words to express something other than and especially the opposite of the literal meaning."
I also understand that irony is a form of humor. This phrase seems to me to be irony, but I can't tell, because I can't tell if it's saying the opposite of its literal meaning.
"What good would fingers be if it weren't for diamond rings?"
I would think that this literally means
"What good would diamond rings be if it weren't for fingers." But it's not exactly the opposite. Is this an example of irony?