My first attempt at training a lora so bear with me, I will try to improve it but it does a pretty good job already. It really likes making blue gems/crystals so I suggest putting something along those lines in the negative prompt. Kinda the same issue with gold. Its not very good at potions so I recommend using other loras trained on potions or other objects like weapons to help with the structure. Share what you make with it, I'd love to see some pretty magic items!