Question: is the gryffindor sword a horcrux?
Answer: It is interesting to note that the sword is the only one of the main relics of the Hogwarts Founders that is not a Horcrux but one of the few things that can destroy a Horcrux. Slytherin's Locket, Hufflepuff's Cup and Ravenclaw's Diadem are the other relics, but are also Horcruxes.