From `Abdul-`Azeez ibn `Abdullaah ibn Baaz to my honorable brother, may Allaah safeguard you!
Al-salaamu `alaykum wa rahmatullaah wabarakaatuh (May Allaah’s Peace, Mercy, and Blessings be upon you).
I have received your noble letter, may Allaah be pleased with you. I have also reviewed the enclosed documents on the properties of the copper bracelet recently made to cure rheumatism. I have considered the whole matter more than once and discussed it with a number of university lecturers. We exchanged opinions on the juristic ruling on the copper bracelet in question, but there were different opinions on the matter; some regard it permissible as it has properties of curing rheumatism, whereas others see that it is better not to wear it, on the ground that wearing it is like the practice of the people of Jahiliyyah (pre-Islaamic time of ignorance), who used to wear copper amulets and bracelets, thinking that they were a cure for many diseases and a reason for the safety of the person wearing them against envy… read more here.