What is the value of a 2004 Gibraltar Tercentenary Two Pound coin with the Queen wearing a necklace?

The Queen was only depicted wearing a necklace on coins using the Third Portrait from 1985 to 1997.

The coin commemorates the Tercentenary of British rule of Gibraltar.

These coins are still potentially in circulation so, unless they are part of a Proof or uncirculated mint set or are individual Proof or uncirculated coins and in absolute mint condition, they are worth Two Pounds.