Things like crystal agate do have the effect of changing people's magnetic field, but they must be of high purity and less impurities. The longer you carry it with you, the stronger your spirituality will be. It's not that you didn't protect it well. Maybe it's true that she blocked something bad for you, as the shop assistant said. Besides, you didn't mean it. That thing is fragile. I broke my agate necklace and ring. It's a pity for a long time, but I'm still fine!
Don't blame everything on feng shui. Just like you accidentally dropped a grain of rice while eating. It means the same thing. Why does it hurt to drop the bracelet? In fact, it's just that I have different persistence in my heart, because it's valuable and expensive, and I don't know until I know the truth. This is just a common phenomenon, and it is completely unreliable to think about supernatural things at will.