8 Things You Didn't Know About Coloured Diamonds

The Gemological Institute of America estimates that of all the diamonds it sees each year, no more than three percent are coloured Prized for their high transparency and knock-out colours, these gems include Blue diamonds such as the 45-carat Hope and the 31-carat Wittelsbach-Graff Completely white diamonds are formed of pure carbon and only start to adopt blue or yellow colours when other chemical elements are present.

In yellow diamonds this is nitrogen, and in blue diamonds this is boron No one really knows what causes colour in pink and red diamonds In comparison to blue or yellow diamonds that owe their colours to these chemical impurities, it is assumed that pink and reds are caused by a mutation that occurs in the diamond's crystal structure as it grows beneath the Earth's surface.

The diamonds mentioned here all owe their colours to the earth's natural processes. . Source