A gold medal is really mostly silver. It consists of just over one percent actual gold and is worth about $644.00. (ksdk.com)
The gold medal is 92.5% silver plated with 6 grammes of gold.
The medal is silver with a 6 gram coating of gold.
Tha depends how you got the medal. Is from a recent Olympic or an ancient one e.g. 1896 or 2010? Does it have any major event atached to it e.g. Miracle on Ice? If it has no historical value, if it's made from real gold, it depends how much gold the medal contains.
An Olympic Gold medal is worth 25,000 U.S. Dollars
6g of gold is used as plate, the medal is 92.5% silver.