Is it permissible for a Muslim woman residing in Switzerland, who sells jewelry online to non-Muslim women who wear it outside the home, to do this work and benefit from its profits?

If the husband provides for his wife in a reasonable manner, he is not obliged to give her a special allowance. Trading in jewelry is permissible under its Sharia conditions, and there is no harm in selling jewelry to disbelievers unless it is known or highly probable that the buyer will use it for an unlawful purpose. If the buyer's situation is unknown, the prevalent custom of people should be considered, because the ruling is based on what is most common.