[Sapphire_Flame]

Of Narya the Great:

...Cirdan later surrendered his [ring] to Mithrandir. For Cirdan saw further and deeper than any other in Middle-earth, and he welcomed Mithrandir at the Grey Havens, knowing whence he came and whither he would return.

"Take this ring, Master," he said, "for your labours will be heavy; but it will support you in the weariness that you have taken upon yourself. For this is the Ring of Fire, and with it you may rekindle hearts in a world that grows chill."

~ The Lord of the Rings, Appendix B

Example: Reviving Theoden from the weariness Grima had inflicted upon him.

Of the Dwarven rings:

Years afterwards Thror, now old, poor, and desperate, gave to his son Thrain the one great treasure he still possessed, the last of the Seven Rings, and then he went away with one old companion only, called Nar. Of the Ring he said to Thrain at their parting:

"This may prove the foundation of new fortue for you yet, though that seems unlikely. But it needs gold to breed gold."

~ The Lord of the Rings, Appendix A

They [The dwarves] use their rings only for the getting of wealth; but wrath and and over-mastering greed of gold were kindled in their hearts, of which evil enough after came to the profit of Sauron.

~ The Silmarillion, "Of the Rings of Power and the Third Age"

Of the Rings of Men:

Those who used the Nine Rings became mighty in their day, kings, sorcerers, and warriors of old. They obtained glory and great wealth, yet it turned to their undoing. They had, as it seemed, unending life, yet life became unendurable to them. They could walk, if they would, unseen by all eyes in this world beneath the sun, and they could see things in worlds invisible to mortal men, but too often they beheld only the phantoms and delusions of Sauron. And one by one, sooner or later, according to their native strength and to the good or evil of their wills in the beginning, they fell under the thraldom of th ring that they bore and under the domination of the One, which was Sauron's.

~ The Silmarillion, "Of the Rings of Power and the Third Age"

I hope you find these quotes helpful, elronds_daughter!

~ Saphy ~