On this page of the Assassin's Creed Valhalla guide, you'll find a detailed walkthrough of the Wincestre side quest: Aelfred's Jewel.
Reward for completing the mission: 1200 XP.
In the place indicated on the image above, you will meet Cedric, threatening the man locked in the house and willing to retrieve Aelfred's jewel. The goldsmith has locked himself in his studio and remains deaf to his cries.
To get inside, go around the building, destroy the window's wooden shutter and jump into the goldsmith's house.
When you speak with him and mention the angry man outside, you'll learn that Aelfred will receive his jewel once the goldsmith receives what he deserves. He had to put out of his own pocket a larger amount than the payment he would receive for doing this job.
- You can cover the difference and hand him 230 pieces of silver;
- Convince him to let go (Charisma level 4 required);
- Take the jewel.
After capturing Aelfred's jewel, go outside and hand it over to the man who came to collect the king's order or keep the precious item for yourself.