I forget the YouTube channel name now, but I recall someone testing some of the cleansing bracelets, with "energy" and "healing" powers...
It turned out that the energy was mostly in the form of radioactive materials, and the only thing you would be healed from by wearing it, was your continued life.
Crystals, on the other hand, are mostly just inert and harmless. So if someone wants to keep a "healing" crystal or whatever on them or put it in their office or something, okay sure. It won't do what it claims to, but it won't hurt you.
But if I see someone wearing a cleansing bracelet, I'm going to reach for my Hazmat suit (since I don't own one, I'm just going to keep a safe distance from the person willingly carrying around what is very likely to be radioactive material), and reevaluate my association with anyone willing to buy such nonsense with absolutely no understanding that it's probably harmful.
I forget the radioactive material used. From what I recall, it's not "drop and run" dangerous, but prolonged exposure is probably going to have some unpleasant side effects... Kind of like radon (it wasn't radon... Radon is a gas with an extremely short half life IIRC, but it can be dangerous to have long term exposure - many years, and it's in most homes.... Buy a radon sensor folks, they're not much more expensive than a good smoke detector).