What is the ruling on selling gold and accessories to women who wear them in front of men, and what should the seller do with the merchandise he possesses?

A woman is not forbidden from wearing such things; rather, what is forbidden is her displaying herself immodestly while wearing them. The questioner's selling these items is not direct or intentional assistance in sin. This type of assistance is not ruled to be forbidden. Therefore, there is no harm for the questioner in selling her merchandise, and the sin falls upon the buyer if they misuse it.