Beutiful and thanks for helping..makes mints seem quite a good choice, now to find some.
Tell me about it. These have proven nearly impossible to find as adults. After nearly a year of searching, I finally tracked down two females, and then found a 1.2 trio a few days later. I bought them all (my wallet is still crying). They all have that sheen you've been asking about, though two of my females have a slightly more bronze-ish cast and show that sheen more. I personally think the greener mints are prettier, but the bronze ones are definitely cooler, primarily because of that sheen.
That said, mints are always worthwhile. They're incredible frogs. Huge, fearless, and just awesome all around. I just sit and watch mine sometimes. You'll love them...though if you find someone with adults, shoot me a PM. I'm sure my male loves the fact that he has four females, but I need another male. Or two.