A Google image search of the photo eventually took me to an Apartment Therapy article that I believe hosted the original photo; unfortunately while the text is still available, the photos have been removed. The article linked Crate & Barrel as the source for the sconces. They are no longer available in the polished silver finish, but C&B has
it in a bronze finish.
You want a wall sconce and I think if you show someone in a lighting store the C&B images, but specifiy you want a silver finish (assuming you do), they can help you find something similar. Or you could get the exact fixture in a different finish.