I know exactly how you feel. I worry for my bangles, since they bang on my glass desk at work. But I must say, it’s happened more than once, and I have yet to find any resulting damage to my bangle. I’m still paranoid, but I worry less. I’ve found they’re pretty tough. Matcha is a little bean pole, and has survived worse. It’s hit things, been banged against things, (not because I don’t care for it, but it’s the bangle I wear the most, my daily bangle. It’s just exposed more) and it’s been a trooper. Not an additional scratch, and no cracks. I’d say not to worry much. Jadeite and Jade was once used for tools, hammering away. The material was so tough, it was used to hit other things, lol. I worry more for scratches than cracking. Since it’s a 7 at most, it could be easier to scratch. So as long as you don’t drag it in concrete or sandpaper, i think our bangles will be ok.