- Randomly found in urns and chests (With Prowler's Profit the chances are greatly increased).
- One may be received from Harrald Law-Giver in Riften next to the Mistveil Keep, sparring with a dummy. He will give a short quest upon speaking to him and the reward for the quest is two random precious gems (Gems given are randomised on reload, however chances of receiving higher value gems, such as flawless rubies, appear to be lower.).
- One can possibly be received after completing some radiant quests such as the one to return Dravin's Bow to Dravin Llanith at Merryfair Farm, however this is random.
- In Shriekwind Bastion, beside the throne in the room with the torture instruments. Spawns a few rubies with chance for flawless.
- The Emperor's Quarters on The Katariah.
- Amaund Motierre carries one.
- Under the word wall in the frozen lake at the Forgotten Vale.
- Heading south from the Kolskeggr Mine, one can find a flawless ruby in a wrecked boat inside a gorge.