金剛石發現于三種類型的礦床中：1、沖擊礫石；2、冰磧物；3、金伯利巖筒。僅在金伯利巖筒中，金剛石才存在于原生巖石中，其形成時的深度大概超過120公里。沖積礫石和冰磧礫石中的金剛石都是從金伯利巖體受到侵蝕作用或冰川作用分離出來，而后再沉積到江河里或冰積物中的。金剛石的顏色從無到黑都有，無色或淡藍色色金剛石價值最高，但很
罕見；大多數寶石級金剛石都略帶黃色。可用強烈的輻射或熱處理來改變金剛石的顏色。極高的折射率使金剛石具有特異的閃光。琢磨恰當的金剛石能反射出更多的光，因而更耀眼。高的色散性使金剛石有火彩，這是由于白光穿過金剛石時被分離成光譜中的各種顏色所致。雖然在莫式硬度表上金剛石為10，剛玉為9，實際上金剛石遠比剛玉硬得多。
he diamond was found in the three types of deposits: 1, 2, the impact of gravel; moraine; 3, Kimberley rock tube. Only in the Kimberley rock tube, diamond is present in the primary rock, the depth of its formation is probably more than 120 kilometers. Alluvial gravel and moraine gravels in diamond are from Kimberley rock by erosion or glaciation separated, and then deposited onto products of the rivers or ice. Diamond color from black to a colorless or pale blue diamond, the highest value, but it is
Rare; most gem grade diamonds are yellowish. Can change the color of diamond by intense radiation or heat treatment. High refractive index to make diamond with a specific flash. The right diamond can reflect more light, and thus more dazzling. High dispersion makes the diamond has a fire color, which is caused by the different colors of the spectrum when white light passes through the diamond. While in the Mo type hardness of the surface of the diamond is 10, corundum is 9, in fact, the diamond is much harder than the corundum. |
