The Rainbow Hoop Earrings are made from sterling silver and niobium coils. Niobium is called a reactive metal because it attains its different colors with differing volts of electricity. These Sunrise/Sunset colors are inspired by the beautiful colors of the sunrise and sunset as I see it from my jewelry studio in Hawaii. These earrings are lightweight and fun to wear! Available in medium size and goldfill instead of silver. Contact me.