Diamonds are born between 75-120 miles down below the planet's surface. As we are told by experts the 1st creation of diamonds was in the region of 2.5 billion years in the past, and the most recent was only 45 million years ago.
The carbon that creates diamonds comes from the burning of pre-existing rocks from the Planet's upper layer. There's a good number of carbon atoms inside the mantle. Temperature transformations within the top mantle causes the carbon atoms to move deeper where they will liquefy and finally turn into brand new rock, as the high temperature lowers. When some other conditions like 'pressure' and 'chemical break down' are correct then the carbon atoms from inside the burning crystal rock, merge to form crystals of diamond.
Not all carbon atoms will end up as diamonds in that movie stars tiara. If the temperature rises or the pressure drops then the diamond crystals may melt partially or totally dissolve. Even if they do form, it takes thousand of years for those diamonds to come close enough to the surface for us humans to get oour hands on.
The Best Way to Make Sure You Don't Buy a Phoney Diamond.
When you consider the high value of diamonds and also take into account the advanced technology now available to criminals, it is hardly surprising that fake diamonds are almost impossible to detect merely by looking at them with the naked eye.
Nevertheless, there are a few precautions you can take to make sure that you don't buy a fake.
Firstly, and most importantly, try to buy from jewellers with a good reputation - preferably ones that you have dealt with before.
Even then, make sure that you can see the diamond's certification.
Examine the setting carefully. A fake diamond is unlikely to have the same high quality setting as the genuine article.
Also look at the diamond itself. Real diamonds are one of the hardest things known to man, poor quality fakes may show scratches that a real diamond could not.
Even after buying the stone, there is one important check you can do. Take the stone to another jeweller and ask for an appraisal.
It is important that you look after the diamonds certificate, as, should the stone be a fake, the certificate will be needed to ensure that you can seek recompense from the jeweller who sold it to you.