As the most concentrated form of wealth on the planet, natural coloured diamonds represent a very unique form of "crystalline art".  The beauty and mosaic arrangement of transparent, reflected colours seen in the face-up direction of a polished coloured diamond is literally "indescribable", similar to looking at other natural colour items, such as rainbows, butterflies, flowers, sunsets, etc.  In natural coloured diamonds, their indescribable beauty is due to the incredible number of inherent body colours that nature has instilled in diamonds, combined with the infinite assortment of colour patterns seen in the face-up direction of every polished coloured diamond.