You can treat “gems” in Oblivion as falling into two broad categories, and what you do with them depends on which type they are:

1. Regular precious gems (diamonds, rubies, emeralds, etc.)

In The Elder Scrolls IV: Oblivion and Oblivion Remastered, normal gemstones and nuggets are basically loot for money and decoration , not crafting ingredients like in Skyrim.

You can:

  • Sell them for gold
    • Diamonds, emeralds, sapphires, rubies, topazes, pearls, gold and silver nuggets are all meant to be sold for income.
* The sale value shows in your inventory; they turn into a steady money source as you clear dungeons and camps.
  • Steal and fence them for Thieves Guild progression
    • If you’re doing Thieves Guild content, stolen gems and jewelry count towards the fenced-goods requirements for the Independent Thievery quests.
* One tip from players is to rob places like Red Diamond Jewelry in the Imperial City, then fence the haul to quickly hit the gold thresholds.
  • Use them as house / display decoration (role‑play)
    • Some players like to collect pretty things—gems, jewelry, scrolls—and lay them out in bowls or on dressers purely for aesthetics.
* This has no mechanical benefit, but it’s popular if you enjoy role‑playing or making your home look like a dragon’s hoard.
  • Modded uses (if you play with mods like OOO)
    • Overhaul mods such as Oscuro’s Oblivion Overhaul (OOO) add extra systems like grinding gems into dust for alchemy or using them in geomancy spells.
* Some forum players even discuss custom systems where enough gem value can be converted into something like a Varla Stone, but that’s a home‑brew/mod idea, not in vanilla.

Bottom line for normal gems:

  • In vanilla : sell them, steal and fence them, or decorate with them.
  • In mods : check descriptions; they may gain alchemy or spell‑related uses.

2. Soul Gems (completely different but often confused)

If by “gems” you partly mean Soul Gems , those are very important and you should almost never sell them :

  • Recharge enchanted weapons
    • Filled soul gems restore the “charge” on enchanted weapons, letting their magical effects keep working.
  • Create custom enchantments and spells
    • Once you join the Mages Guild, get all recommendations, and enter the Arcane University, you can use filled soul gems to enchant weapons/armor and help with custom spell creation.
* Using a filled gem consumes it, so holding a stash is valuable if you like magic gear.
  • Fill them with Soul Trap
    • Cast Soul Trap (or hit with a Soul Trap‑enchanted weapon) and kill the creature while the effect lasts; its soul goes into the smallest gem that can hold it.
* Soul sizes and gem sizes are petty, lesser, common, greater, grand; Black Soul Gems hold humanoid souls and count as grand‑level.
  • Special reusable option: Azura’s Star
    • There is one reusable soul gem, Azura’s Star, obtained through Azura’s Daedric quest; it can be refilled repeatedly and is extremely valuable for enchanting.

Guides and videos for Oblivion Remastered also stress keeping soul gems because they’re your main gateway to powerful enchanted builds, especially when tackling harder content or vampirism cures that require Grand Soul Gems.

Quick answers to likely questions

  • “Should I sell gems in Oblivion?”
    • Normal jewels and nuggets: yes, they’re intended as money/collectibles.
* Soul Gems: no, keep them for enchanting and recharging.
  • “Do gems have any hidden crafting use in vanilla?”
    • No—unlike Skyrim, there’s no smithing or jewelry crafting tied to gems in base Oblivion.
* Extra uses (grinding, geomancy, conversions) are from mods or custom systems, not the base game.

Mini storytelling hook

Imagine your character as a meticulous treasure hoarder:

  • The sparkly stuff —diamonds, rubies, pearls—goes into a fancy silver bowl on your table, and the extras get sold off to fund spell tomes and glass armor.
  • The serious stones —Soul Gems, Azura’s Star, Black Soul Gems—sit in a secure chest, each one a battery waiting to power your next flaming sword or unbreakable shield.

Play that way and you’ll never feel bad about offloading normal gems while still building up a powerful magical arsenal.

Information gathered from public forums or data available on the internet and portrayed here.