Gem Stars F.C. The Gem Stars of Tongoma Football Club, simply known as the Gem Stars, is a Sierra Leonean football club based in the diamond-rich town of Tongoma, Kenema District. The club plays in the Sierra Leone National Premier League, after being promoted from the First Division two seasons ago. The club were relegated after the 2009/10 season. The club's supporters are mainly from the town of Tongoma and Kenema District overall. The Gem Stars' major rivals are the Kamboi Eagles of Kenema. Both clubs are based in Kenema District.