Loads of soda tabs(100+ probably)
A large safety pin
Step 1: Start Collecting
Step 2: Cut N' Bend
Cut 4 tabs on the same side then bend each one. Try to bend the same amount for each one.
Step 3: Connect N' Bend
Now bend the cut part back on the set you put through the hole.
Step 4: Make the clasp
Now take your safety pin and your multitool, and cut the pointy part off of your safety pin so that you don't accidently stab yourself while putting on the necklace.
Put the safety pin through the hole at one end of the chain and put the other part through the other end.