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Diamond unit mobile, displaying the tetrahedral framework The most common crystal construction of diamond is called diamond cubic. It can be formed of unit cells (see the determine) stacked with each other. Even though there are eighteen atoms in the figure, Just about every corner atom is shared by 8 unit cells and every atom in the center of the deal with is shared by two, so you can find a complete of eight atoms for every unit cell.[18] The size of each side from the unit mobile is denoted by a and is particularly three.567 angstroms.[19]

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Cathodoluminescence picture of the diamond, taken inside of a scanning electron microscope Early diamond identification tests included a scratch test relying on the exceptional hardness of diamond. This check is harmful, like a diamond can scratch Yet another diamond, and is never made use of at present. Instead, diamond identification depends on its top-quality thermal conductivity. Digital thermal probes are greatly used in the gemological facilities to separate diamonds from their imitations.

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Many techniques for determining synthetic diamonds could be performed, dependant upon the approach to production and the colour from the diamond. CVD diamonds can commonly be recognized by an orange fluorescence. D–J coloured diamonds could be screened through the Swiss Gemmological Institute's[one hundred sixty] Diamond Spotter.

高÷寬（平均直徑）= 全深百分比以寬度為基準（圓形則以平均直徑數為基準）。

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1 facial area of an uncut octahedral diamond, demonstrating trigons (of constructive and unfavorable reduction) formed by pure chemical etching Diamonds take place most frequently as euhedral or rounded octahedra and twinned octahedra generally known as macles. As diamond's crystal composition incorporates a cubic arrangement of the atoms, they have got many aspects that belong to a cube, octahedron, rhombicosidodecahedron, tetrakis hexahedron, or disdyakis dodecahedron.