The dime coin has been in circulation since 1796. Dimes made before 1964 have a base value of the current price of silver. The most valuable dimes are measured by such standards as condition, rarity and date of the coins, and can be worth in excess of $2 million.
When you are buying gold coins these are the things to look for: Type of coin - Eagle, Sovereign etc. Size of coin - These can vary also. Sometimes measured in value and sometimes in weight. Face Value - 1 dollar or five dollar or even 10 dollar (for US or Canadian coins) for example. Weight - Usually measured in troy ounces or part of an oz but grams have also become a popular weight measurement recently. Fineness - (999% fine) Amount of gold compared to other metals such as silver.