The Cyrus Opal Stud Hoops are a unique twist on our popular classic opal styles. These earrings gently hug the ear and offer a subtle but sparkling touch to any ear stack. Measurements: 6.5mm x 10.5mm Materials: - Silver Plate brass - Synthetic lab created Opal - Cubic Zirconia -Sterling silver post Plated jewelry is a process where a thin layer of gold or silver is bonded onto a base metal. This is a budget-friendly alternative to real gold and allows us to have a wide variety of on trend styles. Our product description will indicate whether the piece has a brass or sterling silver base. It is important to use proper care when wearing and storing these pieces to increase the lifespan of the plating.