Rings on nicely

The rings are really very nice. They shine beautifully and the little gem is very beautiful and yet discreet.
However, the dimensions do not match anyway.
I wanted to give my friend birthday this partner rings, and got a ring he always wears else abducted and measured. I have the inside diameter of the ring measured. Then came the e-mail with an invitation to respond to the mail with the sizes of the rings. I did it again and then compared much to me that the seller does not want to know the inner diameter, but the inner circumference. So again measured. And somehow fit the dimensions not together. I then ordered at random according to the table. They are unfortunately too big. I did not engrave, because I wanted to send them back if they do not fit.
I need to do now, unfortunately.
Also, I must say that I would have returned either way again. Because he looks very Bollig from my small, delicate and slender fingers. I even knew that he is not re-wide, but so wide!
Had he been a little bit narrower and would then also fit the dimensions, there would have been five stars.