What does 188 th mean on earring?

The marking "188" on earrings typically indicates that the metal used is 18 karat gold, which is composed of 75% pure gold and 25% other metals. The "1" in "188" represents the 18 karat gold, while the "88" may refer to the manufacturer's identifier or a specific model number. Always confirm with a jeweler for precise identification, as markings can vary by manufacturer.