What does 925 10 nv engraved on the inside of ring mean?
It means that the Silver was mined in Nevada
925 indicates the purity of the silver out of a possible 1000. A purity of 925 is fairly standard because they take Fine silver (999) and add a small amount of copper to give it strength and beauty. 925 is more commonly known as "Sterling Silver". A US size 7 ring would be size N½ in Australia, Ireland and the UK.
925 is a standard stamp for sterling silver. Other marks include the word Sterling and abbreviations of that. The 925 show how much silver is in the metal, or 92 1/2% silver (with the rest being copper). That is the recognized and legal meaning of sterling jewelry metal. http://en.allexperts.com/q/Jewelry-Gems-Minerals-689/ring-made.htm
BGE 925 stamped on inside of ring means? The 925 means that the ring is made of sterling silver and that the silver is 92.5% pure. The BGE is a designer signature that is used by the Bradford Exchange. Apparently the BGE is a group that "provides general services to the entire Bradford Group," according to its website.