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2. Herkimer diamond - Wikipedia

   en.wikipedia.org/wiki/Herkimer_diamond

   Herkimer diamonds are double-terminated quartz crystals discovered within exposed outcrops of dolomite in and around Herkimer County, New York, and the Mohawk River Valley in the US. [1] [2] They are not diamonds; the "diamond" in their name is due to both their clarity and well formed faces. Because the first discovery sites were in the ...

3. Canadian diamonds - Wikipedia

   en.wikipedia.org/wiki/Canadian_diamonds

   Canadian diamonds. Canadian diamonds are diamonds which have been mined in any one of the provinces and territories of Canada. Diamond-rich areas were not commercially extracted in Canada until the early 1990s. [ 1] For the first 60 years of the 20th century, diamonds originated from kimberlite pipes and alluvial deposits in places such as ...

4. Diamond (gemstone) - Wikipedia

   en.wikipedia.org/wiki/Diamond_(gemstone)

   Diamond[ a] is a gemstone formed by cutting a raw diamond. Diamonds are one of the best-known and most sought-after gems, and they have been used as decorative items since ancient times. The hardness of diamond and its high dispersion of light —giving the diamond its characteristic "fire"—make it useful for industrial applications and ...

5. Carbonado - Wikipedia

   en.wikipedia.org/wiki/Carbonado

   Carbonado. Typically black, can be grey, various shades of green and brown sometimes mottled. 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 ...

6. Golconda diamonds - Wikipedia

   en.wikipedia.org/wiki/Golconda_diamonds

   Golconda diamonds are mined in the Godavari-Krishna delta region of Andhra Pradesh, India. Golconda Fort in the western part of modern-day Hyderabad was a seat of the Golconda Sultanate and became an important centre for diamond enhancement, lapidary, and trading. Golconda diamonds are graded as Type IIa, are formed of pure carbon, are devoid ...

7. There are over a quadrillion tons of diamonds lurking 100 ...

   www.aol.com/article/news/2018/07/16/scientists...

   To estimate the total mass of diamonds in the Earth, the researchers assumed cratonic roots contained 1-2% diamond and combined that with the total volume of cratonic roots distributed throughout ...