Situational Irony is irony involving a situation in which actions have an effect that is opposite from what was intended, so that the outcome is contrary to what was expected. In this example, it shows Mathilde at the park, her body worn down from all of the hard labor she has done over the years all because her greed eventually brought her grief.
Verbal irony is irony in which a person says or writes one thing and means another, or uses words to convey a meaning that is the opposite of the literal meaning. It is shown when Mathilde complains to her husband that she has nothing nice to wear and later on in the story she has lost even more than she had to begin with.
Dramatic irony is a situation, or the irony arising from a situation, in which the audience has a fuller knowledge of what is happening in a drama than a character does. One example in of this is Matilde tells Mme. Forestier that the clasp on the necklace is broken but we (the readers) knew that the necklace was lost and Matilde was lying.