Educated at Llandovery College on a rugby scholarship, he began his rugby career in the Llanelli Scarlets academy. He signed his first professional contract at 18 for the Crusaders and later played for them in the European Super League. Davies initially played prop but could also play in the back row.
A loan spell followed for the South Wales Scorpions and Davies then signed for Limoux Grizzlies in the Elite One Championship where he reached a Grand Final eventually losing to Lézignan Sangliers.
A Welsh speaker, Geraint was often the face and voice of the Crusaders on S4C and British Broadcasting Corporation Radio Cymru.
Geraint Davies won a cap for Wales while at Celtic Crusaders 2008 1-cap. He was named in the Wales team at second row to face England at the Keepmoat Stadium prior to England"s departure for the 2008 Rugby League World Cup. Davies gained further honours while at the Crusaders in the 2009 winning Rugby League European Cup team 4-caps. He scored his sole try for Wales in their 42-12 defeat of Ireland Whilst at Limoux Grizzlies in 2010, he was named in the Wales team at loose forward to face Italy at the Racecourse Ground prior to Wales" Rugby League European Cup defence.