market for sports is larger in terms of market size than jewellery.by expanding in market, Rockall would have larger potential customer base & maybe larger sales volumes.but market share shown in bostonm shows their market share falling & sales dropped Rockall could improve its market share this could increase sales revenue.but market is already dominated by large multinationals.does not appear they are in a very good position, given their branding, to exploit this market at present. .