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瀏覽所有 送給男性 送給父親 送給特別的他 送給男性朋友 啟迪他的心靈 珍貴禮物 奢華小禮物 瀏覽所有 禮物 寶格麗尊榮服務Coloured diamonds comprise impurities or structural defects that bring about the coloration, though pure or approximately pure diamonds are clear and colorless. Most diamond impurities swap a carbon atom from the crystal lattice, often known as a carbon flaw. The most typical impurity, nitrogen, brings about a slight to intensive yellow coloration based upon the kind and concentration of nitrogen present.[36] The Gemological Institute of The usa (GIA) classifies lower saturation yellow and brown diamonds as diamonds in the normal color array, and applies a grading scale from "D" (colorless) to "Z" (mild yellow). Yellow diamonds of higher color saturation or another color, for example pink or blue, are termed fancy coloured diamonds and drop underneath a unique grading scale.[36]
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Most important diamond generating nations around the world Diamond is actually a good kind of the ingredient carbon with its atoms arranged in a very crystal construction identified as diamond cubic. Diamond like a sort of carbon is tasteless, odourless, powerful, brittle reliable, colourless in pure variety, a bad conductor of electric power, and insoluble in h2o. An additional stable type of carbon often known as graphite could be the chemically steady form of carbon at space temperature and force, but diamond is metastable and converts to it at a negligible fee under Individuals conditions.
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The marginally misshapen octahedral condition of this tough diamond crystal in matrix is 求婚戒指 common of the mineral. Its lustrous faces also suggest that this crystal is from a primary deposit Traditionally, diamonds were found only in alluvial deposits in Guntur and Krishna district of the Krishna River delta in Southern India.[132] India led the planet in diamond production from the time in their discovery in approximately the 9th century BC[133][134] to the mid-18th century AD, however the industrial prospective of these sources were fatigued with the late 18th century and at that time India was eclipsed by Brazil where the main non-Indian diamonds have been found in 1725.[133] Currently, One of the more distinguished Indian mines is located at Panna.[a hundred thirty five]
They can be all derived from magma forms that erupt rapidly from tiny quantities of soften, are full of volatiles and magnesium oxide, and they are less oxidizing than more typical mantle melts including basalt. These attributes allow the melts to hold diamonds to your floor in advance of they dissolve.[sixty eight]
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