what are diamonds made from?
928985
Carbon in its hardest form
793999
bcoz DIAMOND has the highest value of refractive index\n2.41\nany little amount of light present has to pass thru diamond \nso diamond glitters all the time
523511
This same question was asked earlier this week.\n\nThe short answer is that all sorts of things can destroy diamond, anything from a rock to a saw to some acids.
276314
Diamonds are almost pure carbon with a few trace elements that give them color.  Coal is a complex hydrocarbon compound of which carbon is only a part.  Synthetic diamonds are made from graphite, another form of carbon, using heat and pressure.  Burning is rapid oxidation.  Diamonds do not burn at anything resembling a reasonable kindling  temperature if at all.  The carbon atoms in diamonds are so tightly bound to each other that it is very difficult to combine them with oxygen.
1130581
Under a pressure of 54.000 bar and at a temperature of 1.400 degrees Celsius is it possible to make from graphite synthetic diamonds.\n\nIn 2004 existed a start-up company named GEMESIS, which produced synthetic diamonds cheaper than natural diamonds.
508159
Check out:\n\nhttp://en.wikipedia.org/wiki/Diamond
273785
A variety of impurities and structural imperfections cause different colors in diamonds, including yellow, pink, blue, red, green, brown, and other hues.
881405
1. A diamond is a specific type of crystal form of Carbon (contrary to what some people say and what some have answered:  a diamond was NEVER coal -- the only similarity is that they both contain carbon.)\n2. You cannot "make" a diamond out of a crystal.\n3. You can try to cut a crystal to maybe resemble a cut diamond, but no one would ever confuse the two.\n4. Crystals have certain alignments of the crystal facies along which the crystal will split -- it is along these facies that an expert will "cut" a crystal to get a specific shape.
877960
Russia does make manmade diamonds, they also sell cubic zirconia and mine real diamonds.
655958
The average diamond is approximately 3 billion years old. Some newer some older. Thats about 2/3 the age of the planet.\nDiamonds are not created in the earths crust, but rather deep in the earths mantle at about 1800 degrees F. The diamonds are brought to the surface by volcanic activity.
842652
Based on this information, no, a diamond will not spontaneously decompose into graphite. It also does not imply that diamonds will last forever. It only states that diamonds are a better carbon based energy source than graphite.
154854
its a f-----ing diamond or a crystal.
447957
The solid phase.  Water is an exception.\nAlso some materials has more than one solid phase, such as carbon which has different structures and therefore different densities for graphic as opposed to diamond.
635804
There is not.  Unlike gold/silver, diamonds are very abundant.  Their price is manipulated and controlled by DeBears.  I would not invest in any type of instrument such as you are describing.\n\nDebears regularly adds/subtracts from the market for specific types of stones depending on what challengers are trying to do.  Ie if a country tries to sell diamonds outside of Debear's pricing mechanisms/controls.  You could easily get killed with such an instrument.
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Natural Diamonds \nNatural diamonds are classified by the type and quantity of impurities found within them. \nType Ia - This is the most common type of natural diamond, containing up to 0.3% nitrogen. \nType Ib - Very few natural diamonds are this type (~0.1%), but nearly all synthetic industrial diamonds are. Type Ib diamonds contain up to 500 ppm nitrogen. \nType IIa - This type is very rare in nature. Type IIa diamonds contain so little nitrogen that it isn't readily detected using infrared or ultraviolet absorption methods. \nType IIb - This type is also very rare in nature. Type IIb diamonds contain so little nitrogen (even lower than type IIa) that the crystal is a p-type semiconductor. \n\nSynthetic Industrial Diamonds \nSynthetic industrial diamonds are produced the process of High Pressure High Temperature Synthesis (HPHT). In HPHT synthesis, graphite and a metallic catalyst are placed in a hydraulic press under high temperatures and pressures. Over the period of a few hours the graphite converts to diamond. The resulting diamonds are usually a few millimeters in size and too flawed for use as gemstones, but they are extremely useful as edges on cutting tools and drill-bits and for being compressed to generate very high pressures. (Interesting side note: Although used to cut, grind, and polish many materials, diamonds aren't used to machine alloys of iron because the diamond abrades very quickly, due to a high-temperature reaction between iron and carbon.) \n\nThin Film Diamonds \nA process called Chemical Vapor Deposition (CVD) may be used to deposit thin films of polycrystalline diamond. CVD technology makes it possible to put 'zero-wear' coatings on machine parts, use diamond coatings to draw the heat away from electronic components, fashion windows that are transparent over a broad wavelength range, and take advantage of other properties of diamonds.
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During mining, several tons of dirt (which has high content of diamond along with dirt) is "washed" and "ground" to break it into smaller more managable peices. This cleaned dirt still rich in diamonds is then rolled over on grease belts. Diamond has very high affinity for grease and sticks on to these belts. The remainder of the dirt is strained under supervision of laser beams which will definitely detect any stray diamonds still left with the dirt.\n\nThis is the modern way of finding diamonds in a diamond rich source. Traditionally, a diamond seeker would look out for diamond nuggets. They would pick up stones and pebbles by estimating the following:\n1. Weight\n2. Shape\n3. Color\n4. Feel\n\nDiamond is an extremely interesting element. To read more about a diamond, go to http://allaboutdiamond.blogspot.com/2005/12/diamond-defined-by-wikipedia.html or if you still want to know more about diamonds just write to me at surbhi.s.gupta@gmail.com
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Diamonds can make you feel really good if they are given to you as a token of love.  \n\nI wanted to make my lady feel special so I researched to find out about diamonds so I could make the right choice.\n\nThe upshot was when I presented the engagement ring, a beautiful pear solitaire just under 3 cts with perfect cut proportions, very good clarity and colour (white to the eye).\n\nWhen I gave here the ring she burst into tears, she was so overwhelmed.  At first I thought I had done something wrong but soon realised what an effect the ring had - she now looks at the ring and thinks back to that moment.\n\nSo, are diamonds a girl's best friend, my answer is they are if they come from the guy you love.\n\nPS - buy your diamonds through reputable companies, there are some good ones on the web.  I used bestdiamonds.co.uk.  The service was amazing and (for the guys) the prices are so much cheaper than the high street.