Silver Round Drop Earrings with White & Blue CZCZ Drop Earrings These sterling silver drop earrings feature a round halo design. Each earring is centred with a sapphire blue cubic zirconia, which is completely encircled by a border of smaller, white cubic zirconia stones. Measuring 15mm in length, the earrings are crafted entirely from sterling silver. They fasten with a continental fitting, which is a secure hinged lever that clicks shut for comfortable wear.