Ahmad ibn Muhammad ibn Isa, from Ali ibn al-Husayn ibn Abd Rabbih, said: I asked Imam عليه السلام: "What do you say about a ring (fuss) made from the stones of Zamzam?" Imam عليه السلام replied: "There is no harm in it, but when one intends to perform istinja (purification after relieving oneself), he should remove it."