وَادَّعَى أَنَّهُ طَالَمَا نَظَمَ دُرَّةً إِلَى دُرَّةٍ فَبَاعَهُمَا بِبَدْرَةٍ
He claimed that he often strung pearl to pearl and sold the pair for a large sum.
Durrah is a pearl; badrah denotes a substantial purse or sum. The sound relation between the words gives his claim a memorable flourish, while the supposed profits sound impressive.
The key is he claimed it: the woman reports his boast, but no evidence of such earnings is yet supplied.