What is the value of a presidential gold coin?

Are you referring to the new Presidential dollar series with the Statue of Liberty on the reverse side? If so, there's been plenty of publicity about these coins. They're made of the same manganese alloy as the Sacagawea dollars so they're only golden colored, not real gold! Also they're struck for circulation use so they're worth exactly $1.00 each. In addition, hundreds of millions are being struck for each president, so they are unlikely to increase in value during the future.

Go ahead and spend it.