I'd say very well (on a Mac Book Pro monitor, which offers a different appearance from the screen on my older Mac at home). Interestingly, colorwise, the FY is most distinctly different from the other two in the top photo, and the WX is most easily distinguished from the other two in the bottom, hand, photo. Honestly though, I am not sure that the appearance of the faceting on the WX doesn't add to its overall different look...

On my craptastic monitor I am not sure I think these show well, but I don't know how much is my laptop being kind of crappy.  The top one they all look almost over exposed... little contrast to the stones unless I tilt my screen way back.

The bottom one the W-X looks very washed out and I can't see really any difference between the FLY and the FY.

My iMac monitor shows less contrast between all stones than my laptop (laptop is a better monitor). On this monitor, it is more difficult to differentiate between the WX and FLY in the first photo and between the FLY and FY in the second photo.

HP laptop - the W-X appears lighter when all I can see is the long facets - one side looks like crushed ice - the color is better (more saturated). Other than that, I can see the color gradations pretty well.