Welcome to the third chapter of Captivated by Colour and this time, blue diamonds are in the spotlight. Considered one of the rarest colours, blue diamonds have an enigma and appeal that very few other colours hold. It’s still April, so diamonds are still the birthstone for the rest of the month. It’s only a small and exclusive group of people around the world who will ever own a blue diamond, but in case you’re thinking of investing in one (because blue diamonds are investment diamonds), here’s all you need to know.
What gives blue diamonds their colour?
Like yellow diamonds, blue diamonds are a result of chemical imperfections in the crystal lattice. When the element boron (B on the periodic table) replaces a carbon atom in the diamond structure, it will impart a blue colour to the diamond. The more boron impurities in the diamond, the deeper the resulting blue colour.
Where do blue diamonds come from?
Once again, South Africa can lay claim to fame here. The Cullinan Diamond Mine, located just outside of Pretoria, South Africa, is the world’s most important source of blue diamonds. Once owned by diamond giant De Beers, it was purchased by Petra Diamonds in November 2007, who have since recovered many significant and important large, blue diamonds. Other countries in which blue diamonds have been found include India, Australia and Botswana.