Taking Stock
M Vainer
![](https://www.jewelleryfocus.co.uk/wp-content/uploads/2016/01/THREE_COOUR_PEARS-e1453369344697-780x470.jpg)
Natural fancy colours are โtruly natureโs aberrationsโ, says diamond expert Richard Vainer. They only form when conditions are on the edge of โpossibleโ for diamond formation, this can create shifts in the crystal structure, or when impurities such as nitrogen (which colours diamonds yellow) or, more rarely, boron (which colours the diamond blue) are present.
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