Vintage delicate gold on stamped 800 silver and paste pendant necklace and brooch metamorphic piece, quality gold vermeil

Vintage / antique 800 silver with gold plate, black onyx and paste floral pendant on 925 silver vermeil delicate chain. The necklace fastens with a spring ring clasp and has a length of 16 inches. The gold vermeil jump ring next to the spring ring clasp is stamped 925. The pendant has a tiny 800 stamp which I have tried to photograph but it is too small to see clearly in the photo - it is readable with a strong loupe! The pendant and chain are in very good vintage condition.