The day after Julie experiences many disappointments (she falls asleep and doesn't hear her timer so she burns the stew; Judith Jones, the editor of Mastering the Art of French Cooking and Julie's dinner guest, cancels because it's raining; and then, worst of all, Julie has a fight with her husband over how concerned she's become about her blog), she goes to work wearing a turtleneck, over which she conspicuously wears the necklace that her husband gave her for her thirtieth birthday earlier in the movie:
This prominent display of the necklace tacitly indicates that Julie is thinking about those better days in her relationship with her husband.