Fancy Green

Green is the rarest of the natural fancy colours but one — only red is scarcer. Its origin is unlike any other. The colour is not an element in the lattice but a scar of natural radiation: over millions of years, radioactive minerals in the surrounding rock bombarded the crystal, displacing carbon atoms and altering the way the diamond absorbs light. The earth itself, slowly, turned the stone green.

A colour that lives on the skin

Because that radiation acted from outside, its effect is often shallow — concentrated in a thin layer at the crystal’s surface rather than running through the whole stone. This makes green the cutter’s heartbreak: the very act of shaping and polishing the rough can grind away the radiation-stained skin and take the colour with it. A green that survives, evenly, into a finished stone is a genuinely rare event.

The Dresden Green

The great exemplar is the Dresden Green — a large, naturally green diamond of exceptional, even colour, and the stone against which all natural greens are measured. That it carries its green so purely and so thoroughly is precisely what makes it extraordinary.

The certification problem

Green is also the hardest fancy to authenticate. The same radiation that colours a stone in nature can be reproduced in a laboratory, and a treated green can look much like a natural one. Telling the two apart is difficult even for experts, which makes independent certification not merely advisable but indispensable for any green diamond.