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碳有數种已知的同素异形体：不定形碳 ，碳奈米泡沫 ，金刚石，藍絲黛爾石 ，蠟石 ，聚合鑽石奈米棒 ，環碳石墨烯、石墨和富勒烯。在热力学上，金刚石的稳定性低于石墨，可自发转变为石墨，但常温常压下这一转变的速度很慢，可以忽略不计，因此钻石得以稳定存在。自然界形成的金刚石一般形成于地球内部高温高压的环境，后来被火山喷发等地殼構造運動带到地表，因此许多金刚石发现在火山附近。现代工业可在高温高压下生产金刚石，称为「合成金刚石」。
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Diamonds Lower glass, but this does not positively identify a diamond because other materials, such as quartz, also lie above glass on the Mohs scale and can also Slice it. Diamonds can scratch other diamonds, but this may end up in damage to 1 or both stones. Hardness checks are sometimes Utilized in useful gemology on account of their perhaps destructive mother nature.[31] The intense hardness and substantial worth of diamond implies that gems are typically polished bit by bit, employing painstaking conventional techniques and bigger awareness to depth than is the case with most other gemstones;[32] these are likely to cause extremely flat, remarkably polished facets with extremely sharp aspect edges.
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"[twenty] Because the equality with the spouses is emphasised within the Roman Catholic Sacrament of Marriage, frequently the bride and groom Every give to another a wedding ring and recite the above mentioned formula in turn.
Diamond is a solid method of pure carbon with its atoms organized inside a crystal. Solid carbon will come in several kinds called allotropes based on the variety of chemical bond. The 2 most popular allotropes of pure carbon are diamond and graphite. In graphite, the bonds are sp2 orbital hybrids and also the atoms sort in planes, with Every single bound to a few nearest neighbors, a hundred and twenty degrees aside. In diamond, They can be sp3 and also the atoms sort tetrahedra, with Every single bound to 4 nearest neighbors.[4][five] Tetrahedra are rigid, the bonds are robust, and, of all known substances, diamond has the best quantity of atoms for every device volume, Which explains why it's both the toughest as well as the the very least compressible.
Most diamonds originate from the Earth's mantle, and most of this section discusses Individuals diamonds. However, you can find other resources. Some blocks of the crust, or terranes, are 對戒 buried deep enough since the crust thickened in order that they knowledgeable extremely-high-strain metamorphism. These have evenly dispersed microdiamonds that show no signal of transportation by magma.
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合成钻石试图利用复制高温高压的环境施加于晶种上，人工制造钻石的生长现象。