Cut an armspan of illusion cord and thread a jumpring to the centre point.  Make sure the jumpring is closed securely. 
Thread a crimp bead onto the two ends of cord, bringing them together and securing the jumpring. Squash the crimp bead leaving 1mm of movement for the jumpring. 

Thread a light grey pearl bead onto the two strands of illusion cord. Thread one gunmetal shell pearl onto each of the strands, separating them.
Thread a light grey pearl onto the two strands of cord, bringing them together again. 
Repeat this pattern until your bracelet is the length you require. 
Keep the tension so that the bracelet isn't too loose. 

To finish your bracelet, end with both cords through a light grey pearl. 
Thread through a crimp bead, through a jumpring and back through the crimp and into the pearl. 
Pull the cords through the pearl to tighten and bring the jumpring closer to the bracelet.
Squash the crimp bead to secure your bracelet. Trim your excess cord and hide the ends in the light grey pearl.
Finally, attach a lobster clasp to your jumpring.