Lovely sparkly opal metallic finish druzy earring studs on rose gold (copper) posts! Opal finish is iridescent clear sparkle with flashes of blue, pink, and yellow. 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.