The ritual of it matters more than the object itself. I've noticed this with hobbies I'm passionate about - when you're intentional about something, you pay attention differently. You're not imagining the mood shift, but the crystal isn't generating an energy field. What's happening is that carrying amethyst is a deliberate pause in your day. You touch it, you remember you chose it for a reason, your nervous system gets a tiny reset. That's genuinely affecting your brain chemistry, just not through crystal vibrations.
The tricky part is that science can't find a mechanism for crystals doing anything beyond this. No studies show measurable bioelectric or quantum effects from stones. But that doesn't mean your experience is worthless - it means the effectiveness is entirely dependent on your attention and intention, which you're already doing right. If you stopped believing but kept carrying the same rock, you'd probably notice the effect fading, which tells you everything about where the real work is happening.
Here's something worth trying: swap your amethyst with a random stone from outside without telling yourself which is which, and track your mood for a week. Keep doing it with different stones. Most people find their "special" crystal still works best not because of its properties, but because of the story they attached to it and the consistent mindfulness it triggered. Once you know that consciously, you can get the same benefit from any object - a smooth river stone, a piece of sea glass, even a specific button. The real hack is applying that intentionality to something cheaper and less precious if you want to, or doubling down on the crystals if the aesthetic and ritual genuinely make you *more* likely to pause and check in with yourself. That's when it becomes actually useful.