Art Deco Flapper Smoky Gray Crystal and Filigree Antique Silver Beaded Necklace

Gently pre-loved with no damage or defects. Antique silver finish with smoky gray iridescent crystal beads. Beads are on a heavy cotton strand with a knot in between each bead for extra security. I suspect this may be Swarovski crystal, but cannot verify. This belonged to my mother who collected Swarovski jewelry and beads. It is stunning and reflects the light beautifully. 20.5” long, not adjustable.