not sure about the NF but 925 is silver i know that much for sure!!
NF 925
what does 925 A mean
(Cwe) Charles winston edition (cz)cubic zirconium (925) sterling silver (nf) nickel free..
925 is the stamp for sterling silver
What does 925 inside a silver ring mean
Stamped inside a ring, the JS initials and the 925 mean the initials of the manufacturer and the karat of the ring. A ring that says 925 means that the ring has 925 karats.
925 on a ring mean
CI 925 Ring with lots of Diamonds
The silver content is .925
What does cc .925 mean on rings
What does CNA 925 STAMP MEAN INSIDE A RING?
925 is the symbol for silver