Identify the purity of gold from the hallmark. When you buy jewelry, ... you can know how much pure gold you have, such as on ...

The U.S. uses the karat scale to determine purity. To keep things simple, the scale is composed of whole numbers between 0 and 24. Objects that score 24k are true pure gold.

The aim of the Flinders-led project was to provide alternative methods that are safer than mercury or cyanide in gold ...

Gold may have a specific purity mark, but this is not always proof of its actual gold content. Some low-quality gold products have higher fineness markings. Also, there are gold-plated fake products.