Explanation

Gems grade diamond is called diamond. The main component is C, with a mass fraction of up to 99.95%. It appears colored due to impurities such as trace amounts of nitrogen and boron. diamond are usually colorless light yellow, and a few are yellow, brown, red, pink, blue, green, violet, black, etc. The Mohs hardness is 10, which is the hardest mineral in nature. The density is 3.52g/cm3, which is very stable. It has characteristic diamond luster and extremely high refractive index and dispersion value, so well polished diamond have strong luster and fire color. It is known as the "King of gems". The 4C classification of diamond refers to the comprehensive evaluation of diamond from four aspects: clarity, color, carat weight and cut to determine the value of diamond. diamond also has thermal conductivity, thermal expansion and flammability. diamond containing B has conductivity and is a high-quality high-temperature semiconductor materials.

Classification