Nenya

Nenya, also known as the White Ring, Ring of Adamant, and Ring of Water, was one of the three Rings of Power given to the Elves of Middle-earth in the Second Age. 
== Appearance ==
Nenya was a white ring made of mithril and set with a white stone of adamant.
== The Lord of the Rings (film series) ==
=== The Lord of the Rings: The Fellowship of the Ring ===
When she saw that Frodo felt pressure for bearing the One Ring, Galadriel showed Frodo her Ring of Power to prove she knew what it was like to be a ring-bearer.