Help me identify these knots

I had a very special necklace with a shark pendant on the bottom. It recently snapped off but I wanted to fix it myself and make an exact replica with the same exact knots. If anyone can help me I would gladly appreciate it ! The second and third photo are the top portion that goes behind your neck. The fourth and fifth are where the shark pendant was on

If anyone can help me identify the material I would also appreciate it. I know the pictures aren’t the best but if possible please. If not I’ll get any material