Lava rock diffusers are amazing. I ordered one and I have it in my bathroom. They last sooo long I ordered more for gifts. I gifted my friends and they love them as well. A nice different aesthetic from any other decoration I have too.

I got lava rocks in the best scent on the planet, coven! And now my car smells amazing!
After a long day at work I pop the top off on my drive home and vibe