This pretty rose gold French Amatory Jewel features a background of brunette hair with the initials AC atop in seed pearls. These love tokens were in fashion in the late 18th century. Surrounding the crystal covered hair and pearls are cushion cut crystals, each one hand cut precisely to fit with the others. These were usually made in England to French taste. Similar examples can be seen on page 146 of the "Georgian Jewellery" book, dating it to the 1790's.
Details......the pendant brooch measures 40mm x 25.2mm.