Description Two is always better than one, and we took that to heart with our Charming Duo Opal Earrings. The earrings set is comprised of two simple small post earrings. The first post earrings have a round opal center surrounded by a silver-tone etched design. The second set is a clear cubic zirconia stone below an opal teardrop shape. Both earrings are attached by a hypoallergenic post-back wire.