What were the horcruxes in the Harry Potter book series?

In the Harry Potter book series, a horcrux is defined as an object that contains a shard of someones soul. The main villain of the story, Voldemort, performed a violent ceremony to split his soul a total of seven times (although one was accidental). The horcruxes he made were Tom Riddle's diary, Marvolo Gaunt's ring, Slytherin's locket, Hufflepuff's cup, Ravenclaw's diadem, Nagini (the snake), and Harry Potter.