I managed to retrieve a few of my old brushes a while ago and since the english version of Clip Studio Paint finally added Clippy I thought to celebrate this I could upload a few materials
This is the same brush as Deco Gems Neon but with a dark blue gem added. Use the brush that suits the feeling of your image best.
I would recommend to use this brush in a very small size as I wasn't very exact when I was drawing the gem.
I hope you have fun decorating your images!!