This emerald cut is an example of why it is difficult to make broad generalized statements about tourmaline. Many tourmalines do not show strong or even noticeably pleochroic/dichroic effects. There are many tourmalines in my collection that can not be oriented to the c axis (principle axis) by any change in tone level or color.
The posted emerald cut has only one color, but it does appear to be somewhat richer down the c axis. This increased tone level in the c axis is expected, but can be difficult to verify in longer ratio emerald cuts. I look at the stone threw the corners to try and get a feeling for how open or different the dichroic colors are before and after I finish an emerald cut. The lack of darkness in the ends of the emerald cut makes it dances with a nice crisp medium green. It is lightly included and not being eye clean is shared with many lighter toned greens. This bright, fun, stone weighs in at 1.34 carats.