Gray coulored ring is fake for sure, real amps have yellow ring and brown letters and they've allways had... and about the separation of the water, it shouldn't separate that much and that clear, also real amps are allways half full.
About the letters, legit amps that I've tried and I know for sure that they are real have small letters with r after winstrol, other ones with caps are old ones and mostly fake ones.
Anyway, good one is hard to find these days and I recommend to ask for the packing with two holograms when you're buying... look at the pic