A glimpse into the world of high-end jewellery selling in London, courtesy of brothers Bobby and Tommy White, who provide bespoke pieces for a stellar list of stars, including Jay Z, Rihanna and Usain Bolt. The brothers lead the pack of young designers supplying the growing list of A-list clients clammering for ever more exotic pieces, from a diamond-encrusted hand grenade to space rockets crammed with gemstones and unique motion rings.