What is an example of foreshadowing in "The Necklace"?

An example of foreshadowing in "The Necklace" has to do with the necklace itself. One day, Mathilde's husband brings home an invitation to "an evening reception at the Ministerial Mansion." Once Mathilde buys a new dress for the event, she decides to take her husband's suggestion and borrow a necklace. Her friend, Mme. Forestier, immediately agrees to loan a "superb diamond necklace" in a "black satin box" to Mathilde.
After a glorious evening, Mathilde and her husband return home and notice that she no longer has the necklace. After much searching, they take the black box to the jeweler whose name was inside the box in the hopes of finding a similar necklace. The jeweler looks at his records and says, "I didn't sell that necklace madame. I only supplied the box." Mathilde and her husband have to borrow a large sum of money to replace the necklace. After ten years, Mathilde sees Mme. Forestier and decides to tell her the truth about the necklace. When Mme. Forestier hears that her necklace was replaced with another, she informs Mathilde that her necklace was a fake, and only worth about five hundred francs.
The foreshadowing occurs when we see that Mme. Forestier easily agrees to loan the necklace, and the jeweler states that he only supplied the box. These are clues that the necklace was not as valuable as Mathilde and her husband believed.