You increase the price of goods that you are trying to sell by some amount greater than their cost to you..
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It's from a set of ordinary quarters that were plated by a private company and sold at high markups as so-called "collectibles". Unfortunately there's almost no secondary market for these items, which means it's really just a copper-nickel coin with a thin plating of gold worth a couple of cents.
QUARTER, just like it's spelled on the front of the coin, not "quoter" And not gold either - it's plated. The mint never struck quarters in gold. For one thing that much gold would be worth a few hundred bucks so putting it in circulation for 25 cents would be economic suicide. What you have is a privately-made novelty item. A lot of private companies took ordinary state quarters, layered them with a small amount of gold, and sold them at significant markups as "collectibles". While they look beautiful there's only a very small secondary market for them. Plus, the gold is only a few atoms thick and would cost more to remove than its metal value.