Giacomo Mancini: Giacomo Mancini. Actor: Top Boy. Giacomo Massimiliano Mancini was born on May 17th,1995 in London, England to English and Italian parents. He is an actor, Best known for his first acting role as Gem in Channel 4s award winning Mini-series Top Boy (2011-13). He went on to star in Ripper Street (2013), Pan (2015) And Orthodox (2016).