actually, to be honest with you... the toggle bar looks a little thinner and longer than on an authentic heart toggle necklace... as to the links... they look thinner and larger... should be smaller... and the hearts hanging off look thinner too.. the toggle and tag necklaces/bracelets are VERY heavy pieces of jewelry....
unfortunately, you can't tell with the pictures because they are blurry, but the way to tell if a piece like that is authentic is that the links are perfect, don't look like they were welded together ANYWHERE... :-/
p.s. my first two pieces came in a drawstring pouch. the newer jewelry i've bought/recieved (this year) come in a little square pouch with a button, so i think they changed the design