Blomdahl Daisy Alexandrite / Rose A 5mm Daisy with Alexandrite and Rose Swarovski Crystals set in the safest material, Medical Plastic. Medical Plastic is unique and truly nickel free. There are no better hypoallergenic earrings available. These nickel free earrings are perfect for anyone with sensitive ears. Light, comfortable, and safe! Happy ears GUARANTEED! Medical Plastic is approved by the FDA for use inside the body.