Cut your chain into 2 equal lengths.
Set 1 aside for your second earring.
On your head pin add a crystal round / gold bead / crystal round.
Wrap your head pin into one end of your chain.
Trim excess wire.
Open your jump ring and add a Curved finding, the other end of your chain, and a curved finding, followed by your lever back.
Close your jump ring.
Repeat for your second earring.