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Lonsdaleite was first identified in 1967 from the Canyon Diablo meteorite, where it occurs as microscopic crystals associated with ordinary diamond. [ 5 ] [ 6 ] It is translucent and brownish-yellow and has an index of refraction of 2.40–2.41 and a specific gravity of 3.2–3.3 .
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. [1]
This part will be removed by me and rewritten, but ultimately should be entirely rewritten with new refs as the book "computational methods and experimental meassurements XV" cites the exact same refs as the former wikipedia refs (mindat. org and the book about w-BN and lonsdaleite) : a "serious" book citing mindat.org as a ref is a joke.
Aim to get 90 to 95% of the spot price when selling gold bars or coins, and 70 to 80% of melt value for jewelry and other items. A karat is a unit of measure for the fineness of gold. For example ...
Diamonds can be sold already set in jewelry, or sold unset ("loose"). According to the Rio Tinto, in 2002 the diamonds produced and released to the market were valued at US$9 billion as rough diamonds, US$14 billion after being cut and polished, US$28 billion in wholesale diamond jewelry, and US$57 billion in retail sales. [108]
The database covers a variety of topics: scientific articles, field trip reports, mining history, advice for collectors, book reviews, [2] mineral entries, localities, and photographs. Much of the information is from published literature, but registered editors may add and revise information and references. [ 8 ]