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https://en.wikipedia.org/wiki/Carbonado
Carbonado, commonly known as black diamond, is one of the toughest forms of natural diamond.It is an impure, high-density, micro-porous form of polycrystalline diamond consisting of diamond, graphite, and amorphous carbon, with minor crystalline precipitates filling pores and occasional reduced metal inclusions. It is found primarily in alluvial deposits where it is most prominent in mid ...Crystal system: Isometric-hexoctahedral (cubic)
https://en.wikipedia.org/wiki/Diamond
Diamond is a solid form of pure carbon with its atoms arranged in a crystal. Solid carbon comes in different forms known as allotropes depending on the type of chemical bond. The two most common allotropes of pure carbon are diamond and graphite.In graphite the bonds are sp 2 orbital hybrids and the atoms form in planes with each bound to three nearest neighbors 120 degrees apart.Crystal class: Hexoctahedral (m3m), H-M symbol: (4/m …
https://4cs.gia.edu/en-us/blog/black-diamonds-what-you-need-to-know/
Oct 11, 2016 · Consumers had little interest in black diamonds until the late 20th century, when designers started using them in jewelry, especially contrasting them with tiny colorless diamonds in pavé settings. Black diamond engagement rings may have come of age when Mr. Big gave Carrie a 5 ct black diamond engagment ring at the end of the 2010 movie Sex ...
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