Only a minimal percentage of the world's diamonds are "colourless" or "almost colourless". Over
95% of all diamonds have an obvious yellow or brown tinge. However, we at VON KÖCK only use
diamonds where absolutely no tint is visible from above – because diamonds are graduated upside
The purity grading of diamonds is done at ten times magnification, but there are diamonds that do
not require magnification to detect inclusions – even in the "slightly included (SI)" and "very slightly
included (VS)" levels. We reject these diamonds, in which inclusions are visible to the naked eye!