Fluorite Natural Stone Necklace Fluorite is also known as the "stone of genius" and is a power stone that enhances thinking and concentration. It is also popular as a charm for entrance exams and tests. In addition, it can bring mental stability and is expected to have a healing effect that reduces stress and anxiety. The effects also vary depending on the color; green fluorite is said to improve concentration and thinking ability, while purple fluorite is said to enhance clarity and analytical skills.