Posted by Symmetric ChaosPretty much all of them.
The ones we use today in the Western are artificially stabilized which is why the dollar doesn't fluctuate noticeably in value month to month. On the other hand the price of gold is reset every day. Just for example, the price of gold spiked very suddenly when the financial crisis hit. The value of the dollar stayed much steadier.
The dollar used to be based on the gold standard - and for good reason. It gave our currency - in fact, every currency around the world - it's value. It was backed/based on something with intrinsic value. Today, the dollar is based on nothing - merely propped up by low interest rates (regulated by the Federal Reserve).
For the latter of your statement regarding the price of gold v. the value of the dollar, such is completely false. When gold prices increase - or any other price in precious metals - it's because the dollar has lost value (purchasing power). Since currencies are no longer based on precious metals, fiat money is created out of thin air and interest rates are manipulated to compete with precious metals. The same applies to other currencies. Basically, precious metals in international markers are saying to the dollar, "Who's your daddy?" Understand?