Diamond called "diamond." That is, we often say that the diamond's original body, which is a mineral composed of carbon, is an allotrope of carbon elements. Diamond is the hardest substance naturally occurring in nature. Diamond's very versatile, such as: crafts, industry, cutting tools. Synthetic diamond can be formed of graphite at high temperature and pressure. Also precious stones. Diamond has a variety of colors, from colorless to black natural diamond has to colorless as particularly good. They may be transparent, or may be translucent or opaque. Many diamond with some yellow, which is mainly due to impurities in diamond. Diamond is very high refractive index, dispersion performance is also very strong, which is why the diamond will reflect a colorful flash of reasons. Diamond in the X-ray irradiation emits blue-green fluorescence. Primary diamond ore output in only a small number of kimberlite or lamproite tube in. Kimberlite is their rock, etc., are to be diamond elsewhere rivers, glaciers and other moving past. Diamond is generally granular. If the diamond is heated to 1000 ℃, it will slowly turn into graphite. China also has manufacturing diamond technology, but the largest, but also 0.2 kt. References to the Gemological Institute of Asia (GIG) Report: diamond chemical composition of C, and carbon graphite with a more homogeneous as variants. In mineral chemical composition, the total content of Si, Mg, Al, Ca, Mn, Ni and other elements, and often contain Na, B, Cu, Fe, Co, Cr, Ti, N and other impurities, as well as carbohydrates. Diamond Mineral crystal structure belongs to equiaxed tetrahedral structure with a very key. Tetrahedral carbon atom located in the top corner and the center, with a high degree of symmetry. Between carbon atoms in the unit cell with the same pole Keyphasor link distance of 154pm. Common crystal form has octahedron, rhombic dodecahedron, cube, octahedron tetrahedron and six and so on. Absolute hardness of diamond is corundum 4 times, 8 times quartz. Detailed absolute hardness follows: 10000-2500 corundum diamond quartz 1550-1200 2500-2100. Mineral brittle, shell-shaped or irregular-shaped fracture at small impact will split along crystal cleavage plane, with moderate or complete cleavage parallel octahedra parallel incomplete cleavage dodecahedron. Pure mineral, density is generally 3470-3 diamond (3) 560kg / m3. The color depends on the purity of the diamond, which contain the type and content of impurity elements, are extremely pure colorless, usually mostly varying degrees of yellow, brown, gray, green, blue, white, and purple; transparently pure, containing impurities translucent or opaque; at the cathode rays, X-rays and ultraviolet light, will emit a different fluorescent green, sky blue, purple, yellow and green and other colors; after sun exposure to the darkroom hair cyan blue phosphorescence; adamantine luster, few grease or metallic luster, a high refractive index, typically 2.40-2.48. 

keywords: Diamond, diamond, diamond tools,