Voldemort valde objekt som han ansåg var tillräckligt viktig för ära, och det kopplade honom till sin barndom i Hogwarts och hans anor. Dumbledore förklarar detta i Half Blood Prince.
"His pride, his belief in his own superiority, his determination to carve for himself a startling place in magical history; these things suggest to me that Voldemort would have chosen his Horcruxes with some care, favoring objects worthy of the honour.”
“The diary wasn’t that special.”
“The diary, as you have said yourself, was proof that he was the Heir of Slytherin; I am sure that Voldemort considered it of stupendous importance.”
Han fortsätter att spekulera på att Voldemort vill ha relikvier i de fyra husen för att slutföra sin samling.
“I can only guess,” said Dumbledore. “For the reasons I have already given, I believe that Lord Voldemort would prefer objects that, in themselves, have a certain grandeur. I have therefore trawled back through Voldemort’s past to see if I can find evidence that such artifacts have disappeared around him.”
“The locket!” said Harry loudly. “Hufflepuff’s cup!”
“Yes,” said Dumbledore, smiling, “I would be prepared to bet — perhaps not my other hand — but a couple of fingers, that they became Horcruxes three and four. The remaining two, assuming again that he created a total of six, are more of a problem, but I will hazard a guess that, having secured objects from Hufflepuff and Slytherin, he set out to track down objects owned by Gryffindor or Ravenclaw. Four objects from the four founders would, I am sure, have exerted a powerful pull over Voldemort’s imagination. I cannot answer for whether he ever managed to find anything of Ravenclaw’s. I am confident, however, that the only known relic of Gryffindor remains safe.”
Så ja, Voldemort letade specifikt efter att grundarna i Hogwarts grundare kunde göra sig till Horcruxes och lyckades få tre. Han övergav bara denna plan vid hans återkomst, och skapade Nagini Horcrux i början av Goblet of Fire.