The ring is a circle, a symbol of eternity, unity, reincarnation and the universe. In earlier times, the ring was associated with the Sun and Moon. It was an object of the protection, which repels negativity.
The ring is acceptable symbol of marriage because its relationship with eternity. People used to place in the ring finger because it was believed that this was the nerve that goes straight to the heart.
Previously believed, that ties up the ring holder with power and energy, depending on the properties of the stone. All rings were once magical or sacred. It is also related to the zodiac or the yin / yang