Catamore 12K GF Circle Brooch with Scarab

This brooch is a rope type circle design with a flourish at the bottom containing an oval set scarab stone. The brooch has a rose gold tinge, and is marked 1/20 12K GF. I have no idea what the scarab stone is, but it feels cold to the touch, so it could be glass or a stone. The brooch is 1 1/8" in diameter. It is in good condition and marked Catamore, as shown