Harry: I thought this was a cute idea and I liked the design.

Ron: Small But meaningful

Neville: You mean a lot to him and wants to show his appreciation.

Seamus: It was his mother's ring so he wanted to give it to you.

Dean: This was what you wanted (But I mean you might not) and he said it was perfect.

Fred and George: Their THE Weasley Twins I think they'd get the same ring. Well wedding band, ^

Cedric:

Oliver: Quidditch related off literal course.

Percy: Small and Simple always wins.

Roger: a Ravenclaws favorite color.

Draco: it's a very Malfoy kind of ring.

Marauders
Remus: He is a freaking werewolf and can't get a very good job. But it worked out fine.

James: He had your favorite flower on it and it reminded him of you.

Sirius: He wanted to remind you that you were his forever.

Severus: If I have to explain your not a true fan.