Jeweller Omar Vaja displays brooches with packaging covered in royal warrant insignia at Bentley and Skinner in central London, Britain, August 19, 2015. Bentley and Skinner, established in the 19th century, is a silversmith and jeweller to Queen Elizabeth. Every year Queen Elizabeth grants about 20 royal warrants, the gold emblem of the British monarchy, in a practice dating back to medieval times. The warrant holders can display the certificate and use the royal coat of arms in their marketing. The warrants lasting five years can help businesses break into new markets overseas, using their role as supplier to the royal family as a gauge of quality. On September 9, Queen Elizabeth will overtake Queen Victoria as Britain's longest-serving monarch. Picture taken August 19, 2015. REUTERS/Toby Melville