Genuine Baltic amber sterling silver ring from Poland

Beautiful Rectangular shaped stone about 1/2 “x 3/4” in sterling silver. I think it is approx size 8 or 8.5. Grams 9.57 ring is stamped. Simple trick to check if real amber rub against piece of wool for several seconds this creates static and should pick up very small pieces of paper. Video attached. I have the ring beside a Canadian 5 cent nickel and a quarter for sizing in addition to the measuring tape