This ring was a present for my mother who has arthritis in her hands really bad. She needs adjustable rings that don't pinch. This ring is a bit on the "thick band" side so I think it will make a great thumb ring and it's not too bad for your middle finger if you can stand the extra band in between. My mom has really big knuckles because of her condition so this ring works great. I will be buying one for myself because it is so beautiful! It reminds me of a wizards wand! It's hard to describe how big it is so I will try to take a photo of it on her hand to show you.

While this ring is "adjustable" - I found it very difficult to adjust - I needed a really strong man to bend it and if you had to bend it too far it feels like it might crack - so just to be safe get the closest size for you (I had wondered why there were sizes for an adjustable ring!). It might be best to go smaller if you are between sizes, making it bigger is easier than making it smaller and if it is too loose it will swing around very easily because of the stones. I wear an 8 on my middle finger so I will be buying a 7.5. I'll let you all know how that goes.