@Keitsu Yeah, this became a bit confusing. But at least we understand now that 5 years have passed and the twins must be a bit more than 10 years old and Ashella is a bit more than 12. Ashella has the makings of being truly freaking broken. She kinda looks like a type of Sasuke of the story.
Still... producing a diamond using coal and body enhancement seems complete bs, even considering magic. Dude would need to create astronomical levels of pressure to achieve such a thing. Probably temperature as well. If it was glass, i would have accepted though.