I've noticed that they do if the end of the eraser is already black from erasing a bunch of stuff, so I try to keep an eye out for that. I like them because they're softer than the pink ones, so I don't have to worry about tearing the paper or about the eraser itself breaking. XD

Just at Wal-Mart or K-mart.^^ They should be in the section with all the pencils and pens. And they should be pretty common and easy to find by now... I remember when they were still really new. XD

Yeah, that's a bit of a technicality. XD. Hmm... Maybe the amethyst is magically suspended between them, and he's reaching out his hand to grab it?