A remix of @hvdzasaur's hearthstone keychain model:
https://www.printables.com/model/612802-warcraft-hearthstone-keyring
Benefits from smaller layer heights for detail, but I think 0.20 actually came out fine (0.2mm layer height is pictured)
Use cyanoacrolate glue (Super Glue) to affix the two pieces together. I prefer the gel style superglue for combining 3D printed parts.
My print was Overture PETG for the main stone and PLASPORT magic chameleon PLA for the insert.
The author remixed this model.
The original model was only one piece and designed to be painted - I modified the original STL to split it into two pieces that can be glued together easily.