To identify a pure silk saree feel the fabric and it should be soft, smooth and slightly warm as you rub it between your fingers. Just like an authentic silk, the glossiness of pure silk is delicate and varies in different lights, while faux silk has consistently too much gloss. And a quick thread test can be helpful too — burn a little thread from the saree, pure silk smells of burnt... https://swastikasarees.com/how-to-identify-a-pure-silk-saree/