I would have Nenya, the Ring of Adamant, the one Galadriel wields. She was able to keep Lorien so beautiful with it!
Vilya. When I was a teenager, I was given a gold ring with a sapphire in it. I used to pretend it was Vilya. I still have the ring, although I can only wear it as a pinky ring now, and even then it's a tight fit.
Narya the Ring of Fire with the power to inspire.