Coloured Diamonds
The yellow seen in diamonds is caused by the trace element Nitrogen. Other trace elements create a rainbow of colours in diamonds. These coloured diamonds are termed "Fancy Colour" diamonds. They have a separate grading system. This system begins with any diamond that has a stronger colour than a Z in the standard grading chart.Colours include pink, yellow, red, and blue. All are extremely rare and come at a premium to traditional colourless diamonds.