18-karat gold and .925 sterling silver Turquoise & Chalcedony gemstones = approximately 38.00 ct. tw. Earrings drop approximately 2.5in Post backs Please note: For earring pairs, ct. tw. refers to the total carat weight of all diamonds and/or gemstones for both earrings combined. It is customary to treat most gemstones to achieve enhanced color and durability. Some of these treatments may not be permanent, and may require special care. Please note: In product titles ct. tw. refers to the total carat weight of all diamonds and/or gemstones combined.