Diamond with adamantine luster and high hardness

The composition of the diamond element C, the crystal was transparent in nature, often with octahedral, tetrahedral, and rhombic dodecahedron has occurred, the color often colorless, yellow, brown, naturally occurring in red, blue, green and so extremely rare. Adamantine luster; refractive diamond cbn wheel  index of 2.417. Hardness of 10, the highest hardness in gems. Density of 3.52g/cm3. Dispersion of 0.044, it is the diamond has a high dispersion, so that the diamond produces colorful color of fire. Diamond Identification
 Diamond with adamantine luster and high hardness, the diamond has been processed gives the first feeling is that its surface with strong luster, ridge angle is extremely sharp. Turn the diamond, the pavilion in its bottom surface visible orange and blue flash. Diamond has lipophilic, the diamond surface drip a drop of oil, you can see the oil on the surface spread into almost a plane. Is the thermal conductivity of diamond gem is the best, even more than the thermal conductivity of the metal are good, so using thermal conductivity meter it can be distinguished from other gemstones, but should be noted that currently there is a gem just artificially produced ---- synthetic silicon carbide, and its thermal conductivity is also high, which can make  sds drill bits use of a magnifying glass, synthetic silicon carbide with diamond with ghosting distinguish. The quality of a diamond is to evaluate four aspects, namely weight (CARAT), color (COLOR), Clarity (CLARITY), cut (CUT), because they are beginning with C, therefore referred to 4C. Weight
 Evaluation of the weight of the primary factor in the diamond, because the price of the diamond is almost the square of the weight of a relationship expressed by the formula: price = weight of 2 × K (factor). Diamond weight commonly "carat" and "minute", said one gram (g) = 5 克拉 (ct), 1 克拉 = 100 points. Carat diamond weighing scales can be used, you can also use high-precision electronic balance, such as the millionth electronic balance. As a unit of weight in carats, the digit after the decimal point, every 9 into a  turbo diamond blade third place. Diamonds can not be weighed against the empirical estimation method can be:
 Standard round diamond = Waist average diameter 2 × depth × 0.0061 (conversion factor, thick waist increased to 0.0064)
 2, the color
 Diamond color can be divided into two series, a series is a colorless to light yellow (brown, gray) series, another series of color series. Color series can be divided into yellow, brown, red, blue, green, pink and so on. 4C, color grading is the first series that is colorless to light yellow (brown, gray) series. Colorless diamonds used in the classification "white" means.