All you need is:
Black fishhook earrings which I got 60 for $1.99 at Micheal's
I used Heart toggle clasps which were also $1.99 at Micheal's
Use a pair of needle nose pliers and open up the ring on the fishhook earrings.
Then hook the top ring of the heart on the earring and close it back up.
I made two pairs one for each of my daughters for Valentines and they will love them.