I just noticed that one of my female auratus' has just darkened up, not as much as the male, but she has some nice blue and black.
It is definitely a female because she is working on her 5th brood in 5 months. I have about 40 Auratus now in my 120XH, and things are getting crowded. I cannot catch them because all of the rock work. I'll definitely catch them when I start to tear down my 120 this week.