A  diamond  has  the  highest  hardness  and  thermal  conductivity  of  any  bulk  material.Diamond  has  remarkable  optical  characteristics.  Because  of  its  extremely  rigid  lattice,  it  can  be  

Most  natural  diamonds  are  formed  at  high-pressure  high-temperature  conditions  existing  at  depths  of  140  to  190  kilometers  (87  to  120  mi)  in  the  Earth  mantle.  Carbon-containing  minerals  provide  the  carbon  source,  and  the  growth  occurs  over  periods  from  1  billion  to  3.3  billion  years  (25%  to  75%  of  the  age  of  the  Earth).  Diamonds  are  

A diamond is made up of two key sections, the Crown and the Pavilion. Their structure and relationship to each other in the form of table and depth percentages have the biggest impact on the diamond’s sparkle.

The round brilliant cut has been used as an example, because with most other diamond shapes (“fancy cut” diamonds) the cut grading is more complicated (hence why their cut grading does not appear on certificates such as GIA).