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Diamonds form about 100 miles (161 km) below the Earth's surface, in the molten rock of the Earth's mantle, which provides the right amounts of pressure and heat to transform carbon into diamond. In order for a diamond to be created, carbon must be placed under at least 435,113 pounds per square inch (psi or 30 kilobars) of pressure at a temperature of at least 752 degrees Fahrenheit (400 Celsius).
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What is the value of the Star of Africa diamond?
The Star of Africa, also known as The Cullinan Diamond, was gifted to the King of England when it was found.None of the cut and polished stones from The Cullinan have ever changed hands for money, so no value or price can be determined. You can read more about these diamonds, below.The Cullinan is a Type IIa diamond, which according to Wikipedia indicates that:"Type IIa diamonds make up 1-2% of all natural diamonds (1.8% of gem diamonds). These diamonds are almost or entirely devoid of impurities, and consequently are usually colourless and have the highest thermal conductivity. They are very transparent in ultraviolet, down to 230 nm."Diamonds of this type have traded hands, for example, in November 2011's Christie's Hong Kong sale. There, a 35.77 carat type IIa diamond sold for US$8,313,760 or US$232,422 per carat. You can use this math to estimate the value of any of the nine gems cut from the Cullinan.
What is the best cultured diamond?
'Best' is a bit of a relative term. Cultured, or lab grown diamonds, are available in multiple colors from multiple labs. I would note that currently very few *white* lab grown diamonds are available. D.NEA has made whites up to one carat and Apollo Diamonds has offered some up to 1/3 carat. Of the cultured yellow diamonds, the major sellers are Gemesis, D.NEA (was Adia), Takara, New Age Diamonds and Chatham. Takara's yellow diamonds seem to be the most consistently 'pure yellow', rather than the more common orange-yellow from the other labs. D.NEA has the largest selection of blue diamonds. Pink diamonds are available at TakaraDiamonds.com and a few other sites like DiamondsCultured.com (made by Chatham). I'll add some links to the various sites and you can research from there, as best is really partially dependent on what color you like and what type of cut you want. Diamond Culture, a new supplier as of October 2009 has a large selection of IGI certified yellow, pink and lime diamonds, all cut in Antwerp. Created-Diamonds.com is an online retailer of cultured diamonds produced by different labs.
What type of rock does a mine form from?
;from coal
What type of environment does pepsin work best?
pepsin would work best at 98.6 degrees Fahrenheit (37 C) because it is the average normal body temperature.
What type of rock weather to form sediment?
erosion
What are geographical conditions where diamonds can be found?
The conditions are not so much geographical as they are geological. Since diamonds are erupted to the earth's surface by a specific type of volcanism with other trace minerals, geologists look for these trace minerals. Kimberlite is a rock produced by this type of volcanism, and is where diamonds are found in, or eroded from. Only about one in 200 kimberlite-trace-mineral sites include diamonds.
What type of geological feature will form where two plates collide?
mountains, crevasses, canyons
What type of environment did the Menan Buttes form in?
Desert environment
Where are the best diamonds found?
Diamond 'connoisseurs' prefer Type IIa diamonds, which are found in India and in South Africa. Type IIa diamonds are the purest form of diamond, containing zero impurities. From Wikipedia: "Type IIa diamonds make up 1-2% of all natural diamonds (1.8% of gem diamonds). These diamonds are almost or entirely devoid of impurities, and consequently are usually colourless and have the highest thermal conductivity."
Are there diamonds in volcanic tubes?
Only in some. Most diamond mines are in or near formations called Kimberlite Pipes, which form as a result of a rather unusual type of volcanic acvtivty that has not beem witnessed in human history. These volcanoes do not form the diamonds, but rather bring the diamonds up from great depths.
What type of geological structure is Uluru?
bella
What type of environment or boime does aquamarine form?
it is made by water and other tools and what not!
What type of geological structures are there?
Folds,Faults,Joints and Un-comformities are some important Geological Structure.
What are yellow diamonds?
Yellow diamonds are a type of diamond. These are diamonds that feature a yellow hue. These diamonds are also called fancy diamonds.
What are some engineering jobs that start with G?
· Geological Engineer · Geophysical Engineer
What type of diamond is the hope diamond?
The Hope Diamond is a Type IIb diamond, classified as such based on it's "...very low levels of nitrogen impurities comparable to Type IIa diamonds, Type IIb diamonds contain significant boron impurities. Type IIb diamonds make up about 0.1% of all natural diamonds," according to Wikipedia.
What are brilliant diamonds?
Brilliant refers to a specific type of cut which is used on round diamonds.
