Gold is known worldwide since its original paper currency was originally simply a promise to pay the bearer in gold. There are currently 9 precious metals, but only Gold and Silver, Platinum, and Palladium are investment commodities. Investors love 4 grams of gold, and it's for good reasons.
Buying & selling gold in Switzerland is currently the most popular way of investing in gold. Gold bullion coins are generally priced based on their weight however a premium is always added to the current price of gold.
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Gold coins may be bought or sold over the counter in most Swiss banks, also by special order in many other banks. You can also buy over the internet or from local coin dealers.
Buying gold bullion bars is the most traditional way of investing in gold and as with Gold coins they can be purchased or sold over the counter in most Swiss banks, also by special order in many other banks worldwide.
You can also buy over the internet or from local dealers in most cases. Gold bars are becoming a less popular option for investors because of difficulties such as the verification process, transportation, and storage associated with owning gold bars.
A gold certificate allows the investor to buy and sell the commodity and eliminate the difficulties associated with owning actual gold. The downside is that you never really have the access to the physical gold.