Glass & Silver Celtic Mystic Knot Purple Bead. Sterling Silver Sterling Silver Aurora Bead is made with unique technology using two layers of silver with the Italian Glass in between. The colour is mystical: purple at the daylight and light blue at artificial light. Celtic knot is a beautiful Irish symbol of Irish Luck, combined with declaration of love and unity and protects against evil spirits. It also represents infinity and eternity because Celtic knots do not contain beginnings or ends Charm is hand finished and made from top quality materials: solid sterling silver 925 and italian glass. All Aurora Charms are fully compatible with similar core size charm bracelets including Pandora, Chamilia, TB etc. Aurora Charm Jewellery enables you to express your unique individuality and design a jewellery piece that is personalized to you.