Brilliant cut :
The modern brilliant cut was developed by Marcel Tolkowsky in 1919. It consists of 58 facets (or 57 if the culet is excluded). It is the most popular modern cut because it provides maximized light return through the top of the diamond.
Color :
White diamonds color range from D (colorless, the purest white) to Z (light color).
D, E and F are colorless diamonds, G, H , I and J are near colorless , K and L are faint color, M to Z have a light color.