The Queen's Necklace

The Queen's Necklace was a virtual representation of one of Arno Dorian's genetic memories, relived by a Helix initiate through the Helix Navigator.

Description
Arno met with Gouze at the Café Théâtre and was tasked with supervising the purchase of Rose Bertin, one of Gouze's contacts.

Dialogue
Arno made his way to the Saint-Jacques area in la Bièvre, where he found Gouze's contact wounded. Arno tracked down Renard's agent. Arno retrieved the Queen's necklace and subsequently met with the smuggler.
 * Gouze: Our friends, Les Actes des Apôtres, are up to their tricks again. Thanks to Colette, we know they acquired the diamond in a raid on the royal treasury. We suspect that their leader, a man known as Renard, plans to sell it to finance a major attack. We can't let that happen. One of our agents is in place to make the buy using counterfeit livres; go to Bièvre and make sure it all goes smoothly.
 * Arno: What happened?
 * Contact: Renard smelled a rat. His men took off with the diamond - you'll have to get it back. We have a man waiting to smuggle it out of the country, but only if you can get it to him within the hour. Hurry!
 * Renard's agent: Come on, you lot. Let's get this rock back to Monsieur Renard. And keep an eye out. I don't want nobody following us.
 * Smuggler: You have it?
 * Arno: Right here.
 * Smuggler: Nice work. Don't worry, the stone will be safely in Russia before the month is out.
 * Arno: (Thank you, friend.)

Outcome
Arno retrieved the diamond, ensuring it stayed out of the hands of Renard.

Reference

 * Assassin's Creed: Unity