A man looks at the window display of jewellery shop "Graff" in Bond Street in London June 6, 2008. Well before the store opens, a window-cleaning van arrives every morning to ensure gleaming windows set off the sparkle of diamonds. A pair of burly guards, in black suits and ear pieces, take their places. Picture taken June 6, 2008. To match feature JEWELLERY/BONDSTREET REUTERS/Stephen Hird (BRITAIN)