For instance, some jewelry might be 18-karat gold, which means it's only 75% pure gold, with 25% alloy content. In that case, the price you'll fetch for that 18-karat jewelry won't be as high as ...

For short-term gold trading, futures are a popular option, according to Steel. Investing in physical gold or ETFs is more ...

In the United States, keeping them separate makes life easier for most journalists, especially since they measure not just different substances but use different metrics: A “carat” measures weight ...

The powder is then melted at above 1,100 degrees Celsius (2,012 degrees Fahrenheit) and cooled again to make gold nuggets, which are then sent off site to be refined to 99.9 percent purity.

The conventional mixture is usually three-quarters gold and one-quarter copper, with a density of about 15 g/cm 3. That's not true for this new lightweight gold: its density is just 1.7 g/cm 3.