The ARC AAA was available in two colors that are "sort of" similar to turquoise, blue and green. If you have ARCs in all three of those colors in one place it's easy to tell them apart /ubbthreads/images/graemlins/grin.gif
The blue Arcs I have seen put out a "royal blue" light, no green in the beam. Not likely to be mistaken for turquoise.
The green ARCs I have seen put out an "emerald green" light, leaning neither toward the blue nor yellow side of green. If your ARC has much blue tint to the beam, it is probably not a green.
Turquoise is blue/green of course. If you can't decide if your ARC is green or turquoise, find a Photon or similar LED light with a known turquoise or green LED and compare.