About the brand: Playful, effortless, and trendy. Sterling Silver Rainbow Moonstone Lab-Grown Gemstone(s): Moonstone = approximately 0.34 ct. tw. Earrings measure approximately 0.65in long x 0.17in wide 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.