Thank you to Yvonne for letting us know about a fan photo that has surfaced on the site DeviantArt. It seems to have been taken on the set of Cherrybomb as Rupert has his hair slicked back and styled as we first reported a few weeks ago. And there's that necklace again!
Update: Here are a few more set reports from HBP with some interesting details... The Leaky Cauldron