Diamonds, as the hardest mineral in nature, can naturally withstand various tests. IGI International Gemological Institute, GIA American Gemological Institute, and NGTC National Gemstone Quality Supervision and Inspection Center are all very authoritative in testing diamond quality standards.

Diamonds are divided into two types: natural diamonds and cultivated diamonds, while some zircon, mosonite, and white sapphire only imitate some external characteristics of diamonds and do not possess some basic characteristics of diamonds.

Laboratory cultivated diamonds are an internationally recognized name, which is referred to as synthetic diamonds in Chinese national standards. Synthetic diamonds are cultivated using modern high-tech techniques such as high-temperature high-pressure (HTHP) or low-pressure chemical vapor precipitation (CVD) in the laboratory. They not only have the same external characteristics as natural diamonds, but also have the same basic properties.

Zircon belongs to silicate minerals. Literally speaking, it is not a diamond. Zircon is naturally formed, but its valuable production is extremely small. There are generally many methods used to imitate drilling. But the commonly seen imitation diamond jewelry in the general market is not zircon. But a synthetic cubic zirconia called cubic zirconia. But due to its lower hardness than diamonds, it is also easy to distinguish with the naked eye.

Mosonite is a type of carbon silicate, but it is very rare in nature. In order to further research, scientists have decided to develop artificial Mosonite themselves. Due to its high hardness and appearance resembling diamonds, it is often used as a substitute for diamonds. But because it is a gemstone with birefringence, it is also easy to distinguish.

White sapphire, also known as white gemstone or white corundum, has similar properties to ordinary corundum, with a hardness of 8. However, some unscrupulous merchants use it to imitate diamonds or heat process it to form blue as sapphire. But it does not have the fiery color of a diamond, and its contents are also different from diamonds, making it easy to distinguish with the naked eye.

In addition, there is a chaotic market for various substitutes that impersonate diamonds, such as artificial spinel, crystals, scheelite, and artificial rutile