Dianasan Diamond

It is said that the brilliant cut or the diamond cut shines the brightest when a rough diamond is polished accurately, and is made to reflect light.

The rough diamond is an octahedron. When the rough diamond shaped as two pyramid’s base is touching each other, and cut in half symmetrically, a square is made. By splitting each of the corners of the square, it makes an octagon in which the symmetrical diamonds can be polished. High skill is necessary for diamonds with 9 to twelve sides to be polished compared to the octagon-shaped diamonds.
However, when it comes to those that have 16 corners, it is more sophisticated since the faces are very precise to polish. Nonagons, especially, do not have any faces that oppose each other making it also difficult to polish.

Octagons= 58 faces of brilliant cut
Nonagons= 65 faces of Sophia
12 sided=86 faces of flare
16 sided= 114 faces of Aztec, Amaterasu, Chrysanthemum, Mona Lisa

On the other hand, when it comes to the quadrilateral shaped diamonds, a high skilled ability will be needed as well to polish since it has a small number of faces. Professionals from Belgium, Israel, Korea, India, and other countries each took more than an a year to polish the diamonds, but could not create a reflection of a flower emblem or a pyramid. Quadrilateral shaped= Nine faces, 13 faces for pyramids/ flower emblems

The 114 tetrahedral chrysanthemum cannot make a reflection since the facet uses high technical skills and even with the smallest mistake, a chrysanthemum reflection cannot be made.
(Computers are used to polish the ones that have rough shapes.)

Just like the Japanese sake, where rice are shaved countless of times fermenting the decent areas, diamonds seek for the best quality.
Diamonds look the same from the outside and merely a round object. However, inside our diamonds, precise and beautiful details can be seen.