Hi everybody! This time I thought I may suggest you a short analysis of the setting.
 The story "Necklace" is set in Paris. We knew exactly, that the events happened in January.

Madame Loisel and her husband were invited to the party in that time: "The Minister of Education and Madame Ramponneau request the pleasure of the company of Monsieur and Madame Loisel at the Ministry on the evening of Monday, January the 18th."

Though we know the approximate month and the date, nothing was said about the year. I suppose the story could happen in the late 19th century, in the years when Guy de Maupassant wrote it. I think that the author showed in his story the life and the society he lived in. He belonged to the period in French society called the Belle Époque or "Beautiful Era" conventionally dated as starting in 1871 and ending when World War I began in 1914. It was the time of optimism, peace, new technology and scientific discoveries. In the same time it was the era of wealth and fashion and Guy de Maupassant vividly showed the spirits of this period in his short story.
P.S.: If you want to know more about the  Belle Époque ==>  CLICK HERE