Cut a length of illusion cord and thread on your rainbow pyrite nuggets and seed beads in alternating order.

Secure one end of your thread to your lobster clasp using a crimp bead and thread the tail of the cord into the beads. 

Attach the other end of the thread to your silver leather tassel and secure with a crimp bead.
Pull the thread to bring the tassel close to the beads. Leave a little room for movement.
Thread your tail into the beads to secure and hide the end.
You can add a drop of glue to secure the crimps in place if you want.