The Ring of Air, also called the Blue Ring. It was gold, set with a sapphire.

One of the Three Elven Rings (the others being Nenya and Narya) made by Celebrimbor. It was given to Gil-galad, who later passed it on to Elrond to help him protect his newly-founded refuge of Rivendell.

It passed into the West with Elrond in the Third Age, some years after the War of the Ring.
Encyclopedia entry originally written by Hathaldir