Anyone know the value of the gold (coloured or possibly real, not sure) Queen's golden jubilee 2002 coin?

It's gold in colour and the one's i have seen online are all real gold. However i cannot find this specific one online. on the front it says 'The Queen's Golden Jubilee' and there is a crown containing '2002' at the bottom. On the back is a picture of the queen and around the edge it reads 'golden jubilee elizabeth II 1952 - 2002. It is bigger than a �2 but not as thick, and does not have a specific value on e.g. 50p or �5. Just found this in my attic anyone know the value? or is it just a piece of rubbish?