Four fire engines and 21 firefighters and officers were called to a fire at a shop in Bruce Grove, Tottenham, on Saturday (22 July) morning.
A jewellery shop on the ground floor was gutted by the fire and a small part of the first floor was damaged.
There were no reports of any injuries.
The Brigade was called at 0448 and the fire was under control at 0637. Fire crews from Tottenham and Stoke Newington fire stations attended the scene.
The cause of the fire is under investigation by the Metropolitan Police Service and the Brigade.