This ring is great for a thumb ring. The design is substantial enough but not overwhelming. I agree with the other commenter that said probably looks best on someone with long fingers, which I do have, if you want it for a thumb ring. So, it doesn't overwhelm my thumb. It is really a very nice and striking ring, and well designed with a good weight to it. I like that it has a little depth and is not flat like some other rings can be. I bought it to wear with another onyx ring that I wear on my ring finger. The only negative I would say, and it's really not a negative, is that if the stones were faceted, this ring would look like a ring you would buy from a high end store. But, it is still a very striking and beautiful ring. Pros: A very striking and beautiful ring. Cons: If you want this for a thumb ring, best to have long fingers.