User blog comment:Strife237/MobiusBound 48/@comment-10603955-20121120231442/@comment-10603955-20121121025531

In the opening menu of Sonic the Hedgehog 2, where you see sonic and tails both striking a pose to the camera, Miles can be seen wearing a purple pixelated collar around his neck. That specific collar was not the kind of necklace that a guy would where to impress a girl, it was the kind of necklace that a girl would wear on a date. Not directly, the necklace gave an interesting implication in that Tails was going to be a girl because of that collar, though Sega made it clear that he was a boy.

I don't really know where the jeweled part came exactly, for from what I remember is that either the menu or in the game itself; Tails collar sparkled with some white dots popping up. They removed that collar in later games.