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.