Are Olympic gold medals solid gold?

The medals shall be at least 60mm in diameter and 3mm thick. The

medals for first and second places shall be of silver of at least

925-1000 grade; the medal for first place shall be gilded with at

least 6g of pure gold.?
Sort of, Only a little part of the gold medals are medal. The 2012 Had the most gold in a gold medal with about 5%.