Is trading in healing crystals and gemstones used in alternative medicine by non-Muslims considered halal or haram?

The ruling on trading in crystals used for healing depends on the ruling of their use for that purpose. The basic principle in healing is the permissibility of everything whose benefit has been proven by religious texts or by sensory experience and experimentation, such as the Quran, honey, and tested medicines, due to the Prophet's (PBUH) saying: "Allah has not sent down a disease except that He has sent down a cure for it." As for anything whose benefit has not been proven, it is not permissible to use it for treatment, and consequently, it is not permissible to sell it for this purpose.

"Healing crystals" are stones believed to cure psychological and physical ailments through supernatural powers, but their benefit has not been proven by religious texts or by sensory experience. Therefore, it is not permissible to use them for healing nor to sell them for this purpose; because that is akin to hanging talismans, which is forbidden, and it falls under associating partners with Allah. Whoever believes that they affect by themselves has committed major shirk (polytheism), and whoever believes that they are a means when they are not, has committed minor shirk.