He shows up at her apartment later. When she peers through the peephole, she's totally got a new one ready (Swarlito, okay, it's not that good, but she's running out of ideas), but as soon as the hinge cracks, he shoves a bag through the door.

"I have a present for you if you get them to stop calling me Swarley."

"No way, Barney!" she exclaims. "My friendship cannot be had with cheap gifts."

"Tiffany's."

"Ooh. Can I just peek inside the bag first?"

He steps inside, sits on her sofa, dangles the bag in front of her with a grin. "You know you want it." He pauses, tucks the small bag in his inner suit jacket pocket. "And no, no peeking. You have to measure the worth of our friendship." He shrugs. "Carats are a pretty good unit of measure."

"Okay, fine, fine, just--can I?" He hands her the bag. "Half carat Asscher cut earrings." She cracks the box open, gasps.

"Oh, Barney, no, no, I'm sorry, I shouldn't--I can't take this."

He just shrugs. "Already drooled on the diamonds, Scherbatsky. Can't take that back now." He slips out the door before she can say anything else.