There are so many things you can do to check the purity of gold. You can start by taking a very close look at the surface of the gold; then, you can proceed by using other deeper tests to check if the gold is pure or not.
1. To check the purity of gold by taking a close look at it, you can start by checking its hallmark. Most materials that are not totally gold in the composition will have a stamp of HGP or GF on them. However, a pure gold material will mostly have a stamp of "24k" or on it, though there are other markings that show the pureness of a gold piece of jewelry.
2. You can also check the purity of gold by looking at its edge and check if it is fading.
3. Conduct a deeper test by exposing the surface of gold to some vinegar and check if there's a change in color. Any change in color is an indication that the gold is not pure.
