The lady gem Diaries
Whether or not you brawl with the Orthon, ambush it, or talk it into dying by its personal hand, you can get the Umbral Gem about the staircase next to its throne. All those quests, however, have to have you to accomplish The Gauntlet of Shar, and reaching it needs you to acquire earlier the main puzzle: Touching an Umbral Gem on the top flooring.