A diamond is the hardest natural substance on earth, but if it is placed in an oven and the temperature is raised to about 763 degrees Celsius (1405 degrees Fahrenheit), it will simply vanish, without even ash remaining. Only a little carbon dioxide will have been released.
Diamonds are formed over a period of a billion or more years deep within earth’s crust – about 150km (90 miles) deep – and is pushed to the surface by volcanoes. Most diamonds are found in volcanic rock, called Kimberlite, or in the sea after having been carried away by rivers when they were pushed to the surface.
A diamond is 58 times harder than the next hardest mineral on earth, corundum, from which rubies and sapphires are formed. It was only during the 15th century that it was discovered that the only way to cut diamonds was with other diamonds. Yet, diamonds are brittle. If hit hard with a hammer, a diamond will shatter or splinter.
The largest diamond
The world’s largest diamond was the Cullinan, found in South Africa in 1905. It weighed 3,106.75 carats uncut. It was cut into the Great Star of Africa, weighing 530.2 carats, the Lesser Star of Africa, which weighs 317.40 carats, and 104 other diamonds of nearly flawless color and clarity. They now form part of the British crown jewels.
The Cullinan was three times the size of the next largest diamond, the Excelsior, which was also found in South Africa. The world’s largest documented polished diamond – unearthed in 1986, also in South Africa – is called Unnamed Brown. It weighs 545 carats and was cut down from a 700 carat rough diamond. It took an international team of expert cutters 3 years to complete the masterpiece. Another impressive diamond that also took 3 years to cut, and also is part of the British crown jewels, is the Centenary Diamond. It weighs 273.85 carats and is the world’s largest flawless diamond.
Not all diamonds are white. Impurities lend diamonds a shade of blue, red, orange, yellow, green and even black. Vivid blue, green and pink mined diamonds are the rarest. They are not the rarest gemstones, however. That title goes to a pure red ruby. Diamonds actually are found in abundance; thousands are mined every year. 80% of them are not suitable for jewelery – they are used in industry or in cheap rings.
Synthetic diamonds
Late in the 19th century, Scottish scientist James Ballantyne Hannay mixed lithium with bone oil and paraffin, sealed it in iron tubes and heated it to red hot. He claimed, in 1879, the resultant stones were diamonds. They were stored away and only many years later they were found to be diamonds, albeit synthetic. In 1892, Henri Moissan theorized that diamonds could be synthesized by crystallizing carbon under pressure. Today, synthetic diamonds is big business, outselling mined diamonds by far. Sometimes called cubic zirconia and synthetic moissanite, they are categorized and evaluated with the same grading scale process as mined diamonds but sell for much less. Synthetic moissanite is a diamond simulant with similar thermal characteristics to mined diamonds and most people, even so-called experts, can’t tell them apart.
Weighing diamonds
A diamond carat differs from a gold carat. The gold carat indicates purity – pure gold being 24 carats. One diamond carat, for mined or synthetics diamonds, is 200 milligrams (0.007055 oz). The word carat derives from the carob bean. Gem dealers used to balance their scales with carob beans because these beans all have same weight.
The colorless Cullinan, the biggest diamond ever found,
weighed 0,62kg (one and a quarter pound) uncut -
it can be replicated easily synthetically
The tradition of a diamond engagement ring started in 1477 when Archduke Maximillian of Austria gave a diamond ring to Mary of Burgundy. The modern tradition is the result of a clever advertising campaign designed by N.W.Ayer in the 1940s, a marketing gimmick still used today. The fact is that most diamonds have little resale or investment value. Diamonds also cause the death of millions of innocent people. Read more at the Conflict Diamonds
View Comments to “Diamond facts”
what the hell
amazing. I din't know you could break it with a hammer
Another fact, diamonds can grow in a few hundred years you know =]
Cool.
Diamonds take so many millions of years to form. Carbon-based materials are exposed to high pressure and temperature, deep within the belly of the earth, below 150 kilometers or 90 miles. Here the pressure is around 5 gigapascals and the temperature is a furnace of 1200 degrees Celsius or 2200 degrees Fahrenheit. It never forms below oceans. The diamonds that are mined are on earth’s surface and these are over 1 billion to over 3 billion years old. We have to respect this stone for its age! So, girls if diamonds are your best friend, remember that it is a rather ancient crony!
dats mean
Please do not believe that diamonds can shatter, they can't. They might chip if hit really hard, they may even break the hammer. At the most, they can 'break' along a cleavage plane if hot at the right angle. Nothing will shatter a diamond under normal conditions.
lol i thoght it was the hardest thing on earth but you can break it with a hammer
very amazing,gained more knowledge abt Diamonds through yhis.
this is wierd
Diamonds are awesome!! luv them a lot! This website is very informational, and you can learn a lot of new things!
PS: i dunno how to spell annonymous!
diamonds are one of amazing gifts of mother nature!but I have never seen them.
Thats not true. They shatter if hit on any angle other than 36.3 degrees. thats the cleavage for diamonds. They are very brittle. If you cut the diamond at 36.3 it will cut, if not.. it will shatter
[...] the original here: Diamonds facts Posted in [...]
what are Diamonds also called
The way diamonds are ranked according to hardness is in relation to how easily it is scratched,NOT shattering or breakage…..a diamond ranks as hardest natural substance in relation to scratching,but ranks lower than steel and certain ceramics as far as being shatter resistance,so yes it IS classed as brittle and can be shattered with a hammer relatively easily and will NOT ever shatter a hammer……….however sctratching or cutting can only be done with another diamond…It is this fact that makes them sought after as jewelry because once its cut and polished a diamond can withstand daily wear for years and still retain its polish and sheen. Please do not believe that diamonds can shatter a hammer,THEY CAN NOT…Ronnie's claim that nothing will shatter a diamond is simply ridiculous and uninformed. For centuries jewelers used “cleaving” as a method of cutting down larger diamond using a chisel(and yes Ronniesoak),,wait for it…..a HAMMER…
Diamonds are the hardest NATURALLY occuring substance. Steel is refined, or made, not natural, so it doesn't get lumped into that category.
dont say bad words
baf
The major investors in the diamond mines realized that they had no alternative but to merge their interests into a single entity that would be powerful enough to control production and perpetuate the illusion of scarcity of diamonds. The instrument they created, in 1888, was called De Beers Consolidated Mines, Ltd.
mother nature?? where is that, I want to see her…lol
How About God create all that. ey?
diamonds are my favourite, there sooo sparkly, like my eyes :D hahah lol
dammmmmm
Nice article! Thank you! Great job!
thank you
tnx for this cite..any further explainations about the oven part;763 degrees celcius..