The 1-ounce gold bar is the most popular option, and according to Brett Elliott, the marketing director at APMEX, Inc., it's almost always a better option than the 1-gram bar because it has a ...

It is usually the most expensive bar type and has a purity of 99.9% gold. Each bar can be broken down into 1-gram pieces manually, which can be useful if you need to use your gold as currency. 4.

The gold bars sold at Costco, however, are much smaller than the standard size, typically ranging in size from 20-500 grams. One troy ounce of gold is about equal to about 31 grams.

The price tag for a 1-ounce South African-made gold bar? $3,279.99, ... One option without a limit is the smaller 5-gram gold bar on an 18-karat gold chain, priced at $1,149.99.

The cons of investing in 1-gram gold bars. There are also a few downsides to consider when investing in 1-gram gold bars, including: Premiums and transaction costs.

Both 1-gram and 1-ounce gold bars can be good investments, so it's important to understand which one fits best in your portfolio. Getty Images ...