The crochet version sold well so I decided to work on a knitted version. The necklace part is crochet chain. A small I-cord can replace this chain. If you don't own a crochet hook you can Google how to make a chain by hand and do this as well.
My daughter loves to wear these to school and keep up with small change. She will be 12 this year and has been wearing them since she was 7.