In order to give an accurate estimate, the coin should be seen. I suggest you take it to a coin dealer and have it appraised.
Please rephrase question.
The coin is 75% copper and 25% nickel, so the coin is likely face value the date is still in circulation.
If you have a US nickel, it is either coated with copper or has changed color due to exposure to some chemical and has no special value. If it is a 1942 Canadian nickel, it varies from $.40 to $1.75 in circulated conditions, $3 and up in uncirculated grades. The material is called "tombac" and is an alloy of copper and zinc.
A nickel with copper infused is still worth 5 cents, as the metal composition of the coin is what determines its value. The added copper may change the appearance of the coin but not its monetary worth.
2 mil
Modified coins have no collector value. Any value would be associated with the ring as a piece of jewellery. The 1948 British Florin is made from a copper-nickel alloy and, in perfect condition (not as part of a ring), it might get up to £8 GBP.
All nickels except "war nickels" from 1942-45 are made of copper-nickel, not silver. What you have is an ordinary coin worth 5 cents.
Six cents to $1, depending on mintmark and condition.
No matter what denomination it is, if found in circulation it's face value.
Copper-nickel. If circulated, it has no particular special value.
The first 5-cent US nickel was made in 1866, the 3-cent nickel in 1865, and the copper-nickel flying eagle 1-cent in 1856.
The melt value of something is the value of the metal itself. For example, a 1964 nickel has a melt value of 5 cents because 1.8 cents worth of nickel and 2.7 cents of copper.