Black Faceted Beaded Necklace, Teardrop Pendant, Glass Crystal Roundel Spacers

Gorgeous black faceted beaded necklace with a large central pear shaped teardrop pendant. There are black and clear rondelle spacers between the graduated beads and it has a special ornate silver (tone?) clasp with a safety catch. It measures approximately 17". This sparking necklace comes from an estate sale, it appears to me to be very nice quality and I assume the beads are glass. This lovely find may be vintage, but I don't know its history and don't see any markings for clues, despite the fancy clasp. Keywords - Formal, semi-formal, cocktail party, party, special event, special occasion, glamour, glamorous, elegant, elegance, dressy, chic, classy, stylish, bridesmaid, rondelle, rondelles, roundels, roundelles, roundelle beads, Swarovski crystals, Valentines Day, Valentine gift, choker, collar