Help: Quest Not Ending

Sorry for the English, I'm using a translator because I am Brazilian
______________________________________________
The quest: Thieving Rodents (lvl min 2)
I'm not managing to complete it, I already have the ring "The Wedding Ring" and I'm not able to deliver it to the NPC quest ...

I click right on it and he answers me always the same
"Farmer Kelri: Kill the rats around here and find the ring for me!"
I have two rings in inventory and need only one...

I've done it several times and can never deliver the ring to the NPC

This is a BUG? What do I do?

 

Are you using the golden nugget or the ghast tear?

 

No, this is not a bug. If you pay attention, he should've said before that it's the wrong ring; explore the cave to get the real one.

 

It is a tear of ghast, which is called "A Wedding Ring"

 

I believe you need the washing machine you can get it by killing the rats outside of the cave

 

True, I got it!!

Thank you bro