What does 909 mean on jewelry?

The number 909 on jewelry typically indicates that the piece is made of 90% silver and 9% other metals, often used in the context of sterling silver jewelry. This designation ensures a high level of purity while providing added strength and durability to the piece. It's less common than the standard sterling silver mark of 925, which signifies 92.5% silver content. Always check for authenticity and quality when purchasing jewelry marked with 909.