Gold Ring with Multicolor Gemstones

This stunning gold ring features vibrant gemstones in green, red, purple, and blue. Perfect for adding a touch of elegance to any outfit. This is 18k GE. Signed with an A with a circle around it. I can’t find what this hallmark means. Maybe someone can tell me in a comment. This ring is super fun and pretty. It has a very thick band so it’s probably a size 6. The band is 3/4” wide. It is preowned with light signs of wear.