Cut 7cm of chain and attach one part of your clasp to the chain using a jump ring, on the other end attach a jump ring and attach this onto the sterling silver bar. 
Place a jump ring on each of the three loops of the bar, for the first loop cut 10cm of chain and attach this onto the bar. For the second strand cut 12cm of chain and for the third cut 13cm of chain and attach to the bar.

Thread on four Freshwater pearls onto a eyepin and attach this onto the chain. Repeat this a further two more times. 
Now repeat step 1 to complete your necklace.