What do you call this color?

Today I went out and bought a new female betta and the more I look at her the more I’m confused by her colors, she is like dark brown with chocolate and blue under tones with blue streaks in her tail, and a white face. I wouldn’t call her a chocolate betta but she’s not black in color either. Anyone know if there’s a term for her coloration? I’ll attach pictures but they don’t show her color well. She’s actually really beautiful!
Thanks!

I'm not sure but she sure is pretty