How did Della react when she opened her gift?

When DELLa opened her gift, she was initially overwhelmed with joy and surprise. She found a beautiful chain for her beloved hair combs, which she had sold to buy him a present. However, her happiness quickly turned to despair as she realized the irony of their sacrifices; they had both given up their most treasured possessions for each other. This poignant moment highlighted the depth of their love, even amidst the bittersweet realization of their sacrifices.