#2 looks good so far but more pictures are needed.
#1 and #3 are fakes. Tiffany never made a "Return to Tiffany" heart toggle necklace. It would have been too redundant with the "Tiffany & Co." already appearing on the lifesaver part you know?
Also in pic #3 you can see the lines where the links come together. You should not be able to see those lines so clearly (or at all) on real Tiffany pieces.
How much are you looing to spend? Is this in your price range?
Auth. Tiffany & Co. Sterling Heart Tag Toggle Necklace - eBay (item 160199375652 end time Jan-22-08 19:31:50 PST)
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Wishlist:
On a ban. Le sigh. Unless they are R&R padded logos
R&R- Alpha Kurts (30); PADDED LOGOS (29) !!!!!!
SFAM- PF Pink As (30); RCA Flynts -old version (31); Lurex anything
all must be long inseams!!