Can't tell color from pictures! All of you folks who think you can tell rough stones from pix, who think you can make an end run around doing the work to identify stones-- you can't. Identifying stones, whether rough or cut, requires study and practice. We would all like to wave a magic wand and have an answer, and it doesn't happen. I work every day at learning. I learn how to use my tools better, how to use my reference stones better, how to recognize some stones by eye (but not many!), and how to slowly build my confidence.
There is absolutely no substitute for study, for work, for practice, and for work.