Investment grade gold, or rare US coins, are called numismatic, semi-numismatic or certified coins. Investors are drawn to the double investment benefits of these historical coins because they not only reap the benefits when the intrinsic metal content of their coins appreciate, they also increase due to their collectible value. Certified coins have consistently outperformed gold and silver bullion. For 35 years, investment grade gold has consistently been one of the top non-leveraged investments in the world. In fact, even when the price of gold has dropped, rare coins have continued to thrive. The reason behind this is that supply, demand, and dealer inventories affect the price far more than the price of gold. Value is also determined by the condition and scarcity of the coins.