Antique ( XVIII or beginning of XIX century ) large Sardonyx shell Carved Goddess & 2 cherubs in Gold or gilded brooch

Made in England or France in XVIII or beginning of XIX century. According to expert old 9 carat gold (but no hallmarks - this time rurally signed). May be Gold gilded. A mythological subject. One cherub is holding a pitcher and pouring something (wine?) into a goblet or wine glass. That second cherub is holding a theorizes. There are 2 crack lines and few stress almost unnoticeable running down each side of the cameo and these will be seen in the photos. Measurements - 52 x 65 (mm), weight - 18 grams.