diamond, ruby, ruby_ring, staff:
own, from my icon pack based on:

key models:

https://opengameart.org/content/card-suits-keys
by Clint Bellanger, based on designs from Justin Nichol
released under CC-BY 4.0

diamond used in diamond key:

https://opengameart.org/content/gems
by Clint Bellanger
originally released under CC-BY 3.0
