Legally Blonde made the bracelets 10xs more popular than before.
You can tell if its a real Tiffany's if you know what you're looking for:
1.) Tiffany's bracelet does NOT have the toggle bar closure. Only the necklace does. If doesn't have a claw clasp, it might be a fake.
2.) Look at the shape of the heart. Tiffany's heart is not perfectly heart shaped. Its heart shaped with a piece at a top that kinda arches over the heart and serves as the loop that connects the bracelet to the charm.
3.) If you get close enough, or have really good eyes, you can see that the bracelet is stamped "Tiffany and Co" near the top of the heart.
There are some pretty good fakes out there, but they usually mess up either the clasp or the shape of the heart. Its kinda like the Kate Spades. An untrained eye would see a black boxy purse with the label and go "oh that's a Sam" but if you know what a real Sam looks like, you know it doesn't have feet, doesn't have gingham or animal print lining, etc
Speaking of Tiffany fakes, Ann Taylor has a pretty good copy of the small Elsa Peretti open heart. Kinda ticked me off - I thought I had a piece that hadn't been copied a million times over yet. Oh well,
I know its real