Stone of Barenziah: Arch-Mage's Quarters
One of the 24 Unusual Gems. Vex in the Ragged Flagon names them once you are in the Thieves Guild.
- Stones of Barenziah – Winterhold
Where to get it
Inside the Arch-Mage's Quarters, at the top of the College of Winterhold.
Found in College of Winterhold.
Good to know
The quarters open partway through the College quest Under Saarthal, so you have to join the College.