Chopard unveils a very rate 85-carat emerald-cut diamond of extreme purity matched by sparkling whiteness. Originating from the Indian mines of Golconda which are well known for their perfect white colour, distinctive lustre and transparency, Golconda diamonds are amongst the most sought-after in the world. And this one is no different, possessing extreme limpidty, whiteness and clarity that places it in the IIA class, n extremely rare and pure category accounting for approximately 1% of all diamonds.