I would price them as decorative glass plates with a pretty pattern. You do not have a set, you have the remainders of what was likely a set. Also, they are not identified as being from any particular maker, they are pressed glass, and the age of them is unknown. I am also not sure that the two larger plates would be properly called chargers unless you have slightly smaller plates that fit on top of them. Your small plates sound like they would be too small to be dinner plates for your larger plates to be formal under plates for them which is what chargers are. I might call your smaller plates either side plates or maybe dessert plates, and you larger plates dinner plates.