Answer:
25 cents if the quarter was made in 1965 or later. Gold plating really adds nothing to the value of a coin and is considered to be damage to a collector. While interesting, the amount of gold used in gold plating is too small to be stripped off and sold and make a profit. However, if the quarter is dated 1964 or earlier, it is a 90% silver quarter and is worth about $6.25 for the silver content in the quarter, but the gold adds nothing to the value.