Question:
Is it allowed wearing of Magen David necklace on the neck ? If it is allowed, then what is the written source for it ?
Answer:
It is permitted for a woman to wear a Magen David necklace around her neck, and there is no problem that I am aware of. For a man to wear it, would be no different than a man wearing any type of necklace, that it is a type of jewelry that is worn by women, unless the facts are that it is the norm for men to also wear necklaces.
Best wishes