It is very difficult to tell if a piece is real silk or art silk from a photo. But you can always burn a small strand from it and burn it. If it is art silk then like plastic it will leave a residue a it like burnt plastic, but the natural silk leaves powdery residue.
Your first piece the fringes could be raw silk but the pile seems to be, what they call worsted wool. New in a shop it probably would be about $300 a square meter, much lower resale value
The second one is the design is Turkmen but the piece certainly isnt. It could even be Pakistan rather than Afghan. Very much doubt that is natural dyes. An honest shop value is $200 a meter but unfortunately some people sell them as silk and for maybe even $600 a meter. Much lower resale value.
You certainly do have taste as while this is not the finest one in terms of weaving it is the best one as it is a genuine piece. I believe it is a Kunduz and I dont think it has much age. If it has I dont think it is more than 10 to 20 years. Shop value is about $300 a meter and the resale value is better than the other ones.
The last one I believe is an Indian Silk. Looking at the quality I would say it is most probably art silk and those basis the honest shop value should be around $250 a meter. Personally wouldnt touch it if you are into genuine hand made pieces but good if you are looking for an inexpensive fancy floor covering.
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