First gold coins were invented by a Lydian king, King Croesus. Today Gold coin may not be a part of our currency, but are a major form of investment. Gold coins are known to be the safest and most risk free form of investing ones savings. Value of a the Gold coin depends on numerous factors such as its rarity uniqueness, its history and its condition ,the amount printed on it also can throw some light on its value.
Gold bullion is a term that refers to gold coins and gold bars that are close to spot price. Gold bullion is usually a little above spot price because of the manufacturing cost. A bullion coin or bar can build numismatic value over time, or go through a circumstance to give it numismatic value. Some circumstances a bullion coin or bar can go through to give it numismatic value is the mint that makes the coin or bar for some reason stop producing them, the coin or bar being a part of a historic event, or any other reason that makes the coin or bar rare or special to investors.
Most countries have one design printed on their gold coins, which remains constant every year. Some countries also produce new prints on their Gold coins for showcasing the significance of that particular year, as every coin in most case has a date printed on it. Nowadays, gold colored coins, coins not made out of gold have made an appearance in currencies of many countries.