What is the anticlimax in gift of magi?

The anticlimax in the short story "The Gift of the Magi" by O. Henry occurs when both Della and Jim discover that they have sold their most prized possessions in order to buy gifts for each other. Della has sold her beautiful hair to buy a platinum chain for Jim's watch, while Jim has sold his watch to buy a set of combs for Della's hair. The anticlimax comes when they realize that their sacrifices have been in vain, as they no longer have the items that the gifts were meant to enhance. This moment of disappointment is undercut by the couple's love and devotion to each other, which is ultimately more valuable than any material possession.