How much are golden stamps worth?

Many countries have an "ugly" policy, to made some "replica" in gold of stamp.

Prices depend on market, if someone is selling or buying. From my experience, that is more that 30 yr in philately - I never discovered real collectors market for material like this - but, real price are same like gold alone on market - in this case - it is worth almost nothing. Probably existed few collectors worldwide that collect "gold" stamp - but it must be very small and very specialized collector/s that will actually give You some real prices. Against, it depends on how much people want to spend for something like this "Gold" stamp.