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- One is needed for the quest The Only Cure.
- The Emperor's Quarters on the Katariah.
- Korvanjund Crypt.
- Shriekwind Bastion.
- In Mzinchaleft, located in a Dwarven Sphere near the entrance.
- Amaund Motierre carries one.
- Randomly found in urns/chests (With Prowler's Profit the chances are GREATLY increased).
- There's one on a tiny, abandoned oar boat on a riverbank to the East of Markarth. West of Karthspire, due South of Kolskeggr Mine. Where, on the map, the Western fork of the river seems to end. It is located just around the bend, south of a small dam, swimming against the current.
(most of these locations seem to be incorrect pertaining to lower levels)
(There is a chance that the stone on the boat will be a Flawless Garnet or an Amethyst)