[SummerSahar]

Well, I bet if you post some pics we could help you identify what they are. Real swarovskis have a glassy appearance to them, whereas plastic looks much more opaque. You can tell if a crystal has an AB coating on it if you can see hints of green, pink, blue and yellow light shooting out from it. Plastic crystals don't have AB coatings. A regular, non AB coated crystal will appear to have silver and white gleaming inside.
But again, I bet some bhuzzers here would be able to tell you what kind of crystals you have if you can post a pic of a closeup of a crystal..