What’s the price of a 925 silver ring goin for?

Bem, that depends on it’s weight, any stones set in the ring,( which may easilly be worth more than the metal), and the quality of artwork that went into it.
For an idea: It is fairly easy to find a simple, silver band, with no engraving or stones for under $20.00 U.S. At the other end of the spectrum, modern artisans are setting stones in handworked silver, and a fine ring can cost $350.00 or more. Above that price, people tend to set stones or work in gold; because it is easier to do detail work and it has a much higher value. Most stones costing over 100.00–200.00 will be set in gold. Antique settings may be in silver, however when the stones had less value or they were made in certain parts of the world.
What does 925 e 5 NV that’s on the side of my ring mean?
925 means it is Sterling Silver, if those are the only hallmarks it is certainly not made in the UK. The NV will be a makers mark, and that probably means either the Nevada Silver Mine or the Nevada Jewelry Company and the 5 is probably the US ring size which is about an I or J UK size so that means you have very small fingers.
How can you tell if a sterling sliver diamond ring is authentic?
If your silver ring is stamped 925 you can be fairly certain it is sterling silver. As far as the diamond part goes you have to use some common sense. If you had the money to purchase a “ large” expensive diamond would you then have it mounted in a silver setting or would you spend the extra money and have it mounted in white gold or even platinum. Gold and platinum family of metals are much more durable materials. Silver is kind of soft compared to them. If your diamonds are on the smaller size then yes I could understand a silver setting. Best bet is go to a reputable jeweler and have 5he stones tested. One thing I want to mention. . . I was reading one of the other answers and they mentioned unmarked rings being made to deceive the buyer. I want to let you know that there are a lot of rings out there which do not have any metal stamp in them. We do them often where I work at. A customer brings in grandma’s ring and wants to use the metal ( sentimental reasons) for a diffrent project . We don’t put a karat stamp on the finished piece. We can not absolutely guarantee grandma’s ring even tho stamped 14k is actually 14k. Sure we could test the metal, and sometimes do. . . But sometimes it has been sized or repaired, we can’t test every single part of the ring. So the customers gold it may actually turn out to be 13.5k or 14,5k. Bottom line just because there isn’t a karat stamp in the metal doesnt mean it isn’t gold. By the same token just because it is stamped 14k doesn’t mean it is gold. Lol most likely it is but one must be careful.