Mousse stone is a kind of diamond imitation, the main component is silicon carbide, and its hardness is 9.25. The main component of diamond is carbon, and its hardness is 10. Mosan stone is not a diamond, but because it is very similar to diamond, it is called Mosan stone when merchants promote it, and its price is much cheaper than diamond. Mosan stone is also very shiny, but the greater the number of carats, the more obvious the difference between Mosan stone and diamond. Jewelry appraisal certificate is also different. The following two test certificates, one is diamond and the other is mosan stone.