14K gold is made of 14 parts gold ingots and 10 parts of some other metal. Gold is often mixed near other metals to give it a specific color, such as white gold ingots. Metals used to alloy gold are silver, copper, nickel, platinum, palladium, tellurium and iron. It is one of these metals to be exact causing the black grades. It is likely to be silver or nickel that is to say the culprit, and there is no honest evidence that this is related to iron deficiency. It may own more to do with the tartness of the affected person's skin.
Here's an article surrounded by Prevention magazine where they tested this phenomenon and fournd individual one of seven people who get a black mark from 14K gold ingots was in truth anemic. An MD they asked explained it was close to a reaction to skin chemistry.
http://www.prevention.com/article/0,5778.
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