A Saturday shopping post, skip if you're just looking for kinky stuff...

So, I'm wanting a longer David Yurman chain, and by longer I mean: longer than 20 inches. 24 inches at least, 26 or 28 inches would be cool. It's actually surprisingly hard to find any high-quality chains that length. (I want a long one because I've got necklaces in shorter lengths, although this heavy chain is very pretty. And I mean a fairly plain chain, although I am also really lusting for this as well.)

I keep looking around on eBay - but I think that much of the jewelry sold there as "David Yurman" is fake. I mean, when you see stuff like this advertised, and then you see the David Yurman merchandise bags being sold on eBay, well, it's hard not to imagine that there's a high probability of getting counterfeit goods.

Has anyone actually bought good jewelry on eBay, and do you have any people you recommend dealing with? Maybe I'm being too paranoid, but even with good eBay feedback, I'm just not willing to spend a chunk of money on something without some strong assurance of it being bona fide.

Alternately: it doesn't absolutely have to be Yurman, although I always like his stuff. Any have any experiences buying a high-quality chain by a different designer?