I have a real David Yurman Round Petit Albion Ring that was bought from a David Yurman store.  I wanted another color, so was looking on ebay only to find a bunch of fakes!  How did I spot them? 

1) The real David Yurman Albion has a stamp to the RIGHT of the center of the ring, on the inside.  The fakes were often stamped to the left. 

2)On the authentic Albions, the stamp reads "(copyright symbol) D.Y. 925" with an illegible blob following.  The fakes had "925 DY" with no copyright symbol or blob.

When I wrote to the seller (who had an extremely high number of transactions), they said that they were just the seller, and were told the items were authentic. 

Beware of fakes!  If you don't care about authenticity but just want the look, then you should be fine, but don't overpay for deception.