The necklace pendant is called a Santi Skull Fob from Lighthound.
To make the necklace adjustable, I used the Double Fisherman's Knot. This knot can also be used to tie adjustable bracelets. I have found that tying simple designs sometimes creates a better end result than trying to tie elaborate designs. This necklace can even be completed without the Santi Skull for a plain look.
KNOTS USED IN THIS POST