As far as I know, there isn't a way to lift the exact hue ID, but most of the colours are different enough that they're easy to tell which they are.
The only problem is the three blue colours - echo, sky, and valorite. They are very close, but when next to each other, are discernible. Conveniently, I own every colour of cu sidhe, and thus I have a chart for myself:
I apologize if you play in the enhanced client as this would obviously be no help. I should definitely make a chart for it.
Anyway, as you can see, the other colours don't look anything like each other, so unless you have one of the blues it shouldn't be a problem identifying them.