Using a chain for self-protection, marketing, and as a marriage gift

Q 1: Is it permissible to wear a chain for self-protection, or use it for marketing commodities, or to present it to a girl as an offer of marriage?

A: First: It is impermissible to use a chain as an amulet to protect oneself or to market commodities and the hypocrisy practiced in such marketing. Second: You may give a gold chain for instance to your fiancée as a gift, not on the basis that it brings benefit or repels harm.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.