Hello. I am seeking a possible resale value for a strand of pearls. The necklace is 20 inches long and consists of 53 near round, 9mm, well-matched golden cultured pearls. The pearls are slightly blemished, have moderate luster, thin to medium nacre, and are slightly abraded at drill holes. The necklace is double knotted and has a white filigree clasp that is not marked-perhaps 800 silver. The necklace is thought to be from the 1960's. My guess (because of the size) is that they are Akoyas, but I am not sure.