I may have to try them on together to see...The ball ring is 3mm in diameter, so I don't know it would be too thick to layer with the Love ring. But you should try it on in the boutique just to make sure.
I think you are right. The Pandora one looks smaller though they don't list the thickness on their website. I saw they had a 14K version for $285. HmmmDoes anyone have any opinions on Pandora's 14K gold?