It's not quite clear what you mean. ALL coins are made in mints, by definition. If you mean a MINT STATE coin, it's a coin that's exactly as it was when it was struck, without being in circulation....
I believe that you are referring to Yap, an island in the Pacific which historically used large stone discs with a hole in the center (like a millstone used to grind grain) as money. These "coins"...
Gold coins are gold in color. They are made of gold. They came from the US but they were made many years ago. They also came from other world countries.