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Something about Colored Diamond
1. Black diamond gets black due to the radiation. Usually it contains much graphite inclusion.
2. Red diamond is most precious diamond.
3. The leading standard of measuring colored diamond is the shade.
4. Senior diamond cutting masters know what kind of shape, what angle and proportion can get best color.
5. The best Collection is the Natural History Museum in America.
For pink diamond:
For green diamond: The formation of green is due to the natural radiation effect in the nature.
Electronic structure changes will happen if radiation energy gets to a certain amount, as a result, diamond will present green.
For blue diamond: It contains no nitrogen but a little bit boron, the latter is the reason diamond presents the color of blue.
For yellow diamond: Because of a little bit of nitrogen are contained in the inside of yellow diamond, and atom N replaces atom C, superfluous electrons then form a new energy level in the forbidden region to make crystal absorb visible light, so diamond presents yellow.