In The Elder Scrolls IV: Oblivion, soul gems (especially Grand and Black) are mostly found in Mages Guilds, Ayleid ruins, certain dungeons, and from specific merchants and quests.

Main ways to get soul gems

1. Static/world locations (guaranteed spawns)

These are hand-placed Grand Soul Gems you can just steal or loot once per playthrough.

  • Arcane University (Imperial City)
    • Display cases in the Archā€‘Mageā€™s Lobby (Very Hard lock) contain multiple Grand Soul Gems, some already filled.
* More in the Magesā€™ Quarters display cases and sometimes on a desk in the enchanting building.
  • Chorrol Mages Guild Hall
    • Two Grand Soul Gems in one display case on the main floor, and three more in another case through the left door as you enter (all Very Hard locks).
  • Dungeons and caves with placed gems
    • Places like Crayfish Cave, Drakelowe (secret fireplace entrance basement), Nornal (on the ruins), Squandered Mine (behind a secret door on the bottom level), Swampy Cave, and other listed locations often have guaranteed Grand Soul Gems in chests or hidden rooms.

These are ideal if you need a few Grand Soul Gems early (for example, for the vampire cure quest) and are willing to pick locks or steal.

2. Merchants that sell soul gems

Soul gems also appear in shop inventories as semiā€‘random loot, refreshing over time.

  • Mystic Emporium ā€“ Imperial City Market District
    • Aurelinwae and Calindil can sell Grand Soul Gems and other soul gems; check them every time their inventory resets (waiting about 3ā€“7 inā€‘game days).
  • Mages Guild alchemists
    • Almost every Mages Guild Hall has an alchemist/vendor who can stock soul gems, including Grand ones at higher levels.
  • Strategy: Make a circuit of all guild halls + Mystic Emporium, then wait a week and repeat until you have as many gems as you want.

3. Quest rewards and quest areas

Some quests either reward you with soul gems or place several in the quest areas.

  • ā€œSins of the Fatherā€
    • Up to four Grand Soul Gems, though many are preā€‘filled.
  • Collector/Necromancer-related quests
    • Several necromancer dungeons tied to collection quests and guild tasks contain altars and chests that may hold Grand or Black Soul Gems.
  • Mythic Dawn / Dagon Shrine
    • A chest in the Dagon Shrine Living Quarters can spawn a Grand Soul Gem when you infiltrate the cult.

4. Black Soul Gems (if you mean humanā€‘soul gems)

If by ā€œsoul gemsā€ you specifically mean Black Soul Gems , they are rarer and tied to necromancer altars and a few stashes.

  • Cheydinhal Mages Guild basement
    • You can find two Black Soul Gems hidden in a container, but you usually need to time entry with the guild master or steal his key to access them.
  • Necromancer altars
    • In various necromancer dungeons, you can use an altar during the correct phase (purple beam active) to convert a Grand Soul Gem into a Black Soul Gem if you soul trap at the altar.

5. General tips for farming

  • Focus on display cases in guilds and at the Arcane University for guaranteed Grand Soul Gems.
  • Make a merchant loop : all Mages Guild halls + Mystic Emporium; wait a week to refresh inventories.
  • Explore Ayleid ruins and necromancer lairs for extra soul gems in chests, Ayleid casks, and on altars.

If you tell me whether youā€™re early game, midā€‘game, or playing the remastered version, I can give you a short, stepā€‘byā€‘step route to grab 5+ Grand Soul Gems as efficiently as possible.