Zall Jewelry bought a gold medal without the 999 logo, which means it is not pure gold. According to relevant information, there is no gold 999 symbol, which is not necessarily true or false. Generally speaking, the darker the color of gold, the higher the purity. In the absence of professional tools to measure the purity, we can simply judge by the appearance color. The gold with high purity is deep red yellow, the purity of this gold is higher than 95%, and the light red yellow is 90~95%. Buying gold jewelry also depends on the test report and certificate, as well as buying it in a regular store.