― The Olympic 2012 starts on Friday, so let's check out the coveted gold medals. ∙ This year's Olympic gold medal weighs about 410g and contains only 6 g of gold or, about 1.34% of its weight. But the doubling in prices of gold and silver since the 2008 Games in Beijing ensure that the medals are the most expensive in Olympic history. ∙ The gold medal consist of 1.34% gold, 92.5% silver and 6.16% copper. ∙ Image: sport.xin.msn.com ∙ The gold, silver and copper, mined [...].