I know the ring you are talking about and I'm looking for it as well. I think it may be CC Skye but haven't confirmed. I will keep looking and let you know.
I've also been obsessed with this ring since seeing on the first episode of the show and have been searching trying to find it! I actually accidentally found it while searching for something else. It's the four pyramid ring and its' made by Noir for $125.00. http://dev.noirjewelry.com/Catalog.aspx?CategoryID=1&PageSize=16&search=&PageNumber=2