How to Make a Hook Clasp
You will need round nose pliers and flat nose pliers.
Step 1: Cut a 3 cm length of 16 - 20 gauge wire. Make a basic loop at one end of the wire.
Step 2: Hold the wire with a thicker part of the round nose pliers and bend the wire around to meet the first loop.
Step 3: You may need to trim some excess wire off the end. Then make a tiny loop to finish the hook.

When using sterling silver wire, you will need to strengthen the wire but hammering with a nylon coated hammer or squeeze the design between nylon jaw pliers.
Variations of the hook clasp: