Investors may need to look more closely at growth prospects at a company level rather than relying on the momentum of the sparkling diamond price rally. City firm Panmure Gordon reckons diamond prices are due a pause, so it's time to look out for company-specific drivers. Panmure's Alison Turner upgraded Gem Diamonds to 'buy' and here we take a forensic look at some of the market's other players in the diamond sector.