Five fire engines, a fire rescue unit and around 30 firefighters have been called to reports of a fire and explosion in what is believed to be a workshop on Denmark Hill, close to Coldharbour Lane in Camberwell, SE5.
Around half of the ground floor of the building has been damaged. Early reports suggest that one man has been taken to hospital by ambulance.
Firefighters from Brixton, Peckham, Old Kent Road and Lewisham are on the scene. The Met Police and London Ambulance Service are also there.
The Brigade was called at 1417.
More top news
Arsenal managed to beat Everton at the weekend but it wasn't enough to finish in the top for the first time in Wenger's time at the club.
The entertainer was held for the murder of Stuart Lubbock, who was found dead in his swimming pool in 2001, but never charged.
Although the diamond was believed to be cut in the 19th Century, its history and how it arrived at the car boot sale is unknown.