I sewed several buttons together onto a piece of spare fabric. I found a metal backing that was shaped like a hoop with another hoop attached to it. I sewed the material onto it and boom. pendant.
I made the cord from the same material. I twisted it tightly, wrapping and sewing cotton around it repeatedly until it held its form. I spent about an hour just sewing in the clasps until they were tight enough but fingers crossed they are in there for good!