Symbolism, Imagery, Allegory
The jewelry store is Holly's escape; it's the place she can go where she feels entirely safe from the "mean reds" that plague her from time to time. Tiffany's is a refuge Holly, and it represents order and security and stability to her. She wants to find a place in the world that she can claim as her own, and she knows that such a place will feel like Tiffany's to her. Tiffany's symbolizes all that the outside world is not, and Holly holds onto it as her ideal.