Finally saw it! - Now Just the Ring.

[Carol]

md wrote: 
> I got the ring and locket momentarily mixed. However, the diary has nothing to do with Slytherin because it started with Riddle. <snip>

Carol responds:
How do you figure? The whole point of the diary, which contains the memory of Tom Riddle framing Hagrid for the murder of Moaning Myrtle, is Tom Riddle's proof that he's the Heir of Slytherin. that's what makes it valuable to Tom--it's the proof that he opened the Chamber of Secrets and released Slytherin's monster, which only Slytherin's true heir could do. The point is made repeatedly in Cos and again in HBP when Harry says that the diary is "nothing special" and Dumbledore contradicts him.

Carol, noting that though Tom Riddle put the memory in the diary, the memory relates to the Chamber of Secrets, which started with Slytherin