Celtic Mystic Knot Purple Bead

From the Manufacturer:

Celtic Mystic Knot – Purple Bead. Sterling Silver Aurora Bead from our Glass & Silver Collection. The bead is made unique way. We are using two layers of silver with the Italian Glass in between. Celtic knot is a beautiful Irish symbol of faith, eternal love and unity. It will protect you against evil spirits. Irish Celtic knot also represents infinity and eternity because it does not have beginning or end. Glass has mystic colours. It looks light purple during the day and under the sun, and light blue in the evening, under the artificial light. This is our only bead with this intriguing colour effect.