“Go ahead,” answered Daisy genially, “and if you want to take down any addresses here’s my little gold pencil.”
Daisy brings up Tom’s history of cheating here to make him feel uncomfortable. That is because she is planning to leave him for Gatsby at this time. So she has no problem with him writing down the address of all the girls he meets because she doesn’t need him anymore. The gold pencil also highlights that she is gold money because gold is a color often associated with old money; plus someone whose pencils are even golden are bound to be wealthy.
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