What does 925 star mean on a white ring?

The "925" mark on a white ring indicates that the metal is sterling silver, which contains 92.5% silver and 7.5% other metals, usually copper, to enhance its durability. The star symbol may imply additional branding or design elements, but it doesn't have a standardized meaning in jewelry. Together, they signify the quality and authenticity of the material used in the ring.