Cedric Diggory's wand

The wand of Cedric Diggory was 12¼".It was made from ash wood, with its core being a hair from the tail of a unicorn.

It was made by Garrick Ollivander, who described it as "pleasantly springy" during the wand-weighing ceremony of the Triwizard Tournament. Ollivander stated that the hair in the wand was from a particularly fine male unicorn, which was seventeen hands high and nearly gored Ollivander with its horn after he plucked the hair from its tail. Cedric looked after his wand well and polished it regularly. It was last seen clutched in Cedric's hand against his chest when Harry Potter brought Cedric's body back to Hogwarts.

Appearances

 * Harry Potter and the Goblet of Fire
 * Harry Potter and the Goblet of Fire (film)
 * LEGO Harry Potter: Years 1-4

Behind the Scenes

 * Whilst it is truly unknown what happened to the wand after Cedric's death, it is most likely that he was buried with it&mdash;ash wands are so devoted to their original owners that they tend to lose their power when they change hands, especially if the core is Unicorn hair, like Cedric's was. He was also known to have cared greatly for it (polishing it often, as aforementioned) so it would seem fitting to bury him with it (even without the long-standing wizarding tradition of burying wand and owner).
 * J.K. Rowling based Harry's, Ron's, and Hermione's wands off of the wand woods correlating to their date of birth and the Celtic tree calendar. However, as Cedric's wand is made of ash, J. K. Rowling did not choose this wand based on Cedric's [assumed] period of birth. Like Hagrid's wand wood, it could be based on a symbolic reference to Cedric's personality and character.
 * The ash tree symbolizes sacrifice, sensitivity, and higher awareness. Likewise, the wand wood should reflect Cedric's sacrifice of his life, and his sensitivity to Harry's welfare by helping Harry figure out the clue to the second task, in Harry Potter and the Goblet of Fire.

Notes and references
J. K. Rowling Official Site, Tree Meaning and Symbolism