Of course not. Diamonds are precious because the first diamond is the natural substance with the highest hardness in nature, and its Mohs hardness reaches 10, so it basically won't wear, and its durability is extremely high, but it also has some weaknesses, because it is fragile and can't resist violent impact. The refractive index of the second diamond is very high, 2.42, which is much higher than that of glass, about 1.5. It shows dazzling diamond luster in the light, which is the root of diamond fire color. The fire color of the third diamond is not only related to its own material properties, but also related to other properties of the diamond. According to the 4C standard of GIA of American Gemological Society, that is, weight, clarity, color and cutting. The weight is only one size. The bigger the diamond, the more light it can naturally reflect, so the bigger the diamond, the brighter it looks. The higher the clarity, the less impurities in the diamond and the more transparent the diamond is. Colored diamond can be divided into white diamonds and colored diamond diamonds. White diamonds gradually turn yellow from D to Z, D is white and transparent, and Z is yellow, but it can't reach the color level of yellow diamonds. Cutting is the key to whether the diamond shines, because the reflective surface of the cut diamond is fixed, and the cut diamond can reflect most of the light incident on the top of the diamond, as well as colorful light. Therefore, the better the quality of the diamond, the better the cutting, and the more shiny it will be.

What you said is that there are many imitations of diamonds, such as synthetic zircon. The key to the difference is that zircon has birefringence, and you can see double shadows on nearby corners, but diamonds don't. Moreover, the cutting of diamonds is very good. Generally, circular masonry has 57 sections, and zircon sections are less, which is also a feature.