Antique 10K Gold Amethyst Brooch

Antique gold brooch is marked what looks like CXK and has been tested by a jewelry for 10K gold.  It features a 5/8 inch by 3/8 inch oval Amethyst in an ornate carved floral setting.  It measures 3/4 inch by 1 1/4 inches wide and it weighs 2.9 grams.  It is in great condition.