Hi!
This Gem Set is used in my Tiara and Crown 3D object models
https://sketchfab.com/sk-pro/collections/tiaras , https://sketchfab.com/sk-pro/collections/crowns .
This model is in FBX format for your covenience where you can access for every element of the set.
For best results tweak your own render engine and materials.
Best Regards.