FORMS OF DIAMONDS

The diamonds mined out generally have twelve faces. In India the diamond pieces have by and large eight faces and in Brazil's mines the diamond pieces are uneven or tetrahedral. If viewed through a triangular magnifying glass the trigonal marks or depressions can be seen. Almost all diamond pieces lack electricity conductivity. However, when rubbed it generates electricity. But it allows heat to pass through it without itself being heated, which is why when touched it feels cold.

By applying high heat energy diamond pieces get decolorized, but when cooled the original colour returns again. It is said that you can read a book under the light of a piece of Diamond: Put a piece of diamond in a vacuum glass test tube. When the electric charge would be given to tube, the diamond would exude so much light that you can even read a book under it. It is because the pure diamond piece is transparent and allows light go through it easily, which an impure piece of diamond does not do. The diamond pieces are also transparent under the X-rays, which the impure pieces of diamonds are not. This easily differentiates between the pure and impure diamonds.