Square selling authentic and expensive FF jewelery isn't new, as they've been doing it since VIII was released and they probably request Tetsuya Nomura to cover his characters with bling in the first place. However it is a little odd for them to be selling jewelery from Advent Children, which isn't even out yet and no one knows anything about.

Not like that'll stop them, though! This Cloudy Wolf ring bears the emblem from Cloud's shoulder pad, which you can see right on the left:
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Do you see it?! Okay, good. If you're living in Japan (or can fake it), you can have this ring yourself for only 14,000 yen (about $130), and then all you'll be missing is a tub of hair gel and super-blonde coloring.