Lovely sparkly ultra violet metallic finish druzy earring studs on gunmetal posts! Ultraviolet finish is iridescent dark blue and purple. A super lightweight resin that looks and feels like a real druzy gemstone! Approximately 12mm (a half inch) across. Hypoallergenic lead and nickel-free post earring studs - great for sensitive ears! Securely affixed to posts with jewelers' grade epoxy adhesive. Proudly made in the USA!