VTG Art Deco Era c. 1918 Pendant Necklace with Gem

Early 20th century alexandrite paste necklace in sterling silver with a gold wash. Pendant gem is an oval faceted, bezel set, open backed alexandrite paste crystal that can look either blue or purple. Finely worked filigree floral clasp stamped with a patent #1257158, for the date of 1918. *17+1/2 inch wearable with a 2+1/2 inch center drop x 3/4 wide. *Good vintage condition