When you buy gold jewelry you will know that you are not buying something that is made of pure gold. When mined gold is actually anything but pure, being an amalgamation of several metals including silver, platinum, copper and others. We actually purify gold these days but it is then re-alloyed before being used in jewelry making. Each country has its own standard when talking about the purity levels of gold but in the UK 9 carat, 14 carat,...