There are no seven deathly hallows, there are only three of them. The three deathly hallows are: The Elder Wand, The Resurrection Stone and the Invisibility Cloak.
Did you mean horcruxes? Because as Linhousepotter said there are only three Deathly Hallows, but there are seven horcruxes: Riddle's diary, Marvolo's ring, Slytherin's locket, Hufflepuff's cup, Ravenclaw's diyadin, the snake Nagini, and Harry himself.
