There are many factors involved in style. Style refers to how a story is told, and how the author uses words. In “The Necklace,” the author makes good use of the ironic style. The story is told with a third person limited narrator.
Mathilde suffered ceaselessly, feeling herself born to enjoy all delicacies and all luxuries. She was distressed at the poverty of her dwelling, at the bareness of the walls, at the shabby chairs, the ugliness of the curtains.
The effect of this style is that the reader sees things from Mathilde’s point of view, and limited to her point of view. This way we are more surprised when we find out that the necklace is fake. However, by not making the story first person we are really not inside Mathilde’s head. We keep some distance from her, and therefore lack sympathy.
In this case, the use of irony makes the story very allegorical. We are learning a lesson about wanting to live above our means, and being thankful for what we have instead of always wanting more.