What is 825 nf on jewelry?

In jewelry, "825 nf" typically refers to the metal's purity and composition. The "825" indicates that the piece is made of 82.5% silver, which is equivalent to sterling silver (commonly noted as 925), but with a slightly lower purity. The "nf" could stand for "non-ferrous," indicating the metal is non-iron based, or it may refer to a specific manufacturer's mark. Always check for additional markings or context to confirm the exact meaning.