These stones have gone out of the game. They used to be rewards in boxes from the Lothlorien instances in Moria. Now each of the instances reward you with Medallions of Lothlorien. You will notice the barter NPCs (class trainers in Lothlorien) also take these to get your armors.
The Medallions drop in these Moria instances:
Hall of Mirrors (Zirakzigil)
Chamber of Wheels (Waterworks)
Hall of Crafting (in The Flaming Deeps)
These are 3-man instances and the medallions are awarded from daily quests to defeat bosses, and in boxes. After starting Vol II, book 7 (chapter 1), the elf NPC sends you back into Moria and there are other quests associated with these instances. If you visit Chamber of the Crossroads, there are some Dwarves who give you quests in these instances.
Collect your Lothlorien Medallions and you can barter for 3 pieces of (+15) radiance armor.
Edited, Nov 12th 2010 3:12pm by Dottiel