Sage's Oath

If you somehow manage to lose your ring after you've reached Revered and cannot turn the quest in, you can drop the quest, reacquire it, and she'll give you the ring again. You can turn in -- at which point she'll give you Sage's Covenant.

You get Friendly reputation and access to the first ring as you complete Hyjal attunement with Soridormi ("The Vials of Eternity" quest).

Official site list of all the rings from reputation with Scale of the Sands (only obtainable from Caverns of Time: Mount Hyjal raid instance), including the last version at Exalted:

http://wow-europe.com/en/info/basics/factions/scaleofsands/index.html

Note that Soridormi pats in a circle around the room.