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Most diamonds along with having small amounts of defects or impurities will have a tinge of yellow or brown which is why truly colourless diamonds are so rare.ĭiamonds have a high refractive index of 2.417 and a dispersion of 0.044 which means that when light passes from air to a diamond which has a different density to air the speed of light slows down and bends the light due to the angle of refraction. It’s very rare to find a diamond that doesn’t contain flaws which is why such diamonds demand a high price the same can be said for colour. Although diamonds are extremely expensive their price is very much governed by what’s known as the four Cs, carat, cut, colour, and clarity. They are extremely hard and until recently were regarded as the worlds hardest natural material with a rating of 10 on the Mohs hardness scale. The last of these magma volcanic eruptions occurred over 20 million years ago which brought up diamonds close enough to the surface so that they could be mined.ĭiamonds are naturally occurring gems that are composed of carbon atoms arranged in a particular structure. We can’t mine down far enough to reach the earth’s mantle but fortunately volcanic eruptions have done the job for us.
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All of this happened between 1 billion to 3.3 billion years ago when the earth was much hotter than it is today. At depths of over 100 miles below the earth’s surface the simple carbon containing minerals were transformed into diamonds by the heat and pressure of their surroundings. Unlike other gemstones diamonds are formed in the earths mantle a semi-molten layer between the earths outer core and crust that’s subject to extreme heat and pressure. There is still a growing demand for diamonds and with their diminishing supply and extremely high costs other less expensive substitutes are used in their place. Today this is no longer the case as diamonds are available from various channels around the world where their price is governed by globalized market economies. For years the price of diamonds were kept artificially high by carefully controlling the quantity of diamonds that were allowed to reach the market place by one company who had a monopoly over their distribution. Nowadays Diamond engagement rings are not only glamorous they have a very special meaning attached to them, they symbolise commitment and the next chapter in a couple’s life, which combined with their beauty is why they are so desirable. No longer were diamonds seen as a gem reserved only for Royalty and the highest of society, they came to represent love, affection and faithfulness. The ad campaign is regarded as one of the most successful in history and changed the general public’s perception of diamonds. Today the saying is very much true, but traditionally gold bands were used for the symbol of a wedding union until 1938 when DeBeers launched their advertising campaign “A Diamond is Forever”.
#LIGHT CONVERSE COMPARISON MOVIE#
‘Diamonds are a girl’s best friend,’ a phrase and song made famous by the 1949 movie Gentlemen Prefer Blondes in which Marilyn Monroe first performed the song.