Steal necklace from the Merchants

Daren Hightower's house can be found in the Heights district of the Hub. His house is heavily guarded, but if you sneak in at night you should be able to make it in and out without being seen. In a room toward the lower left of his house is a strongbox. There is a trap that will explode if you try to lockpick the box before disarming it, but inside is the fancy gold and diamond-encrusted necklace.