Antique Victorian bright sapphire blue paste riviere Y necklace, open backed large stones

Beautiful 19th century antique gold tone and sparkling cornflower blue paste semi riviere necklace. The necklace consists of linked ornate claw settings each containing a faceted oval vivid blue rhinestone set in an open backed antique gold tone setting. I don't know if the settings are gold or gold plated. There is a central drop with the same blue paste stone. The necklace has a slim choker length of about 15 inches in length and the clasp is a simple antique hook clasp. The necklace is in very good vintage condition.