What does a AU 10k mean on a earring with a jewel?

"AU 10k" on an earring indicates that the piece is made of 10 karat gold, which means it contains 41.7% pure gold mixed with other metals for durability. The "AU" symbol is the chemical symbol for gold, derived from its Latin name "Aurum." This marking signifies the quality and value of the gold used in the earring, with 10k gold being a popular choice for jewelry due to its balance of affordability and durability.