Diamonds are the hardest mineral in nature.
 
A diamond has a melting point of 3820 Kelvin.
 
Diamond jewellery is the most expensive jewellery of them all.  In 2009, a diamond weighing 7.03 carats was sold for $9.49 million.
 
This making it the most expensive diamond in the history.
 
Approximately 50% of all natural diamonds originate from Africa.
 
Synthetic diamonds ,cubic zirconia, were made back in 1955.
 
Some natural coloured diamonds are rare such as red, green, pink and green diamonds.
 
Black diamonds are more common and are sometimes used in engagement rings as they are less expensive
 
Diamonds need extremely high temperatures and high pressure to be created.
 
Diamonds come in volcanic pipes . The magma erupting to the surface carry diamonds.