You have to inspect your coin carefully. If it has a P or D mint mark, it's made of copper-nickel, not silver and is only worth 25¢.
If it has an S mint mark and a copper-colored edge it's a copper-nickel proof coin worth maybe $2 to $10 depending on its quality.
If it's in a holder labelled "Prestige Proof", then it IS a 90% silver coin. These were made for collectors and sell for $3 to $12 depending on quality and which state is depicted.
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Neither the US nor Canada have struck circulating silver coins since the 1960s. If your coin is a collector's issue such as a US Prestige Proof, please post a new, separate question with more details.
If you found it in change your nickel is only worth face value. US nickels made from 1866 to mid-1942 and from 1946 to the present are made of a copper-nickel alloy, not silver. In fact, no circulating US coins have contained any silver since 1969.
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The simple answer is that any US quarter dated 1964 or earlier is worth many times its face value because these coins were made of 90% silver. However if a quarter is older than roughly the late 1930s / early 1940s its collector value may be higher than its silver value but that depends on the coin's specific date, condition, and mint mark. For that you have to look at a values guide such as the Red Book, PCGS.com, Numismedia.com, etc.
Not gold, and not proof. All proof coins dated 2000 were minted in San Francisco, and the US never struck gold quarters. You almost certainly have a normal Philadelphia quarter that's been plated with a thin layer of gold. The plating makes it an altered coin with no added value.