The Ring of Water, also called the Ring of Adamant and the White Ring. It was wrought of mithril and set with a diamond.

It was made, along with the other two Elven Rings, Narya and Vilya, by Celebrimbor who then gave Nenya to Galadriel. It was then that she said the Elven Rings should be kept secret and hidden from the power of Sauron.

Galadriel used Nenya to keep Lothlórien strengthened and beautiful.
Encyclopedia entry originally written by Hathaldir