A garnet and half pearl necklace, mid 19th century, composed of clusters of foiled circular-cut

A garnet and half pearl necklace, mid 19th century, composed of clusters of foiled circular-cut garnets and half pearls within gold cannetille borders, spaced by links set with half pearls, connected by rectangular links with stamped floral decoration to a double backchain of fancy rope twist linking and a garnet and half pearl clasp, length 45cm, French assay marks for gold and silver, faint assay mark, possibly Vatican city, gross weight 50 grams