It is like a trend nowadays where people are diverting the interest to the Gold investment. It is not too obvious to me that people are diverting their interest to gold since the gold price are keep on increasing over time. Let take a look on the picture on left side attached in this post. The price of the gold a keep on increasing. The same principle happening for the Gold Coin.
If you were to buy any Gold coin like US Gold coin auctions, you have to be aware that there is a risk of buying it. Below is the general principle that you should follow.

1.Research.
Make sure you do a lot of research about the gold coin that you are planning to buy regardless with type of gold coin that attract you interest. This is very important in order to identify the originality of the coin. The scope of you research should not be limited to the online research but also the offline research like museum.

2. Seller profile
If you are planning to buy gold coin from any website, make sure you look at their seller information and profile. Sometime some website like Ebay has the feature of seller reputation. If you can see that the seller information are good and can be trusted, you can deal with them.

Hopefully the simple general above will guide you to buy any gold coin. Happy shopping.