It is much harder to find a rectangular cushion - Square Cushions are far more common.
Even then, of the rectangular stones you do find, it's rare to find one this well cut- you get total, even sparkle coming off of this baby!
Also the color of the sparkle is strong yellow. The stone has a tremendous color for an Intense Yellow. Definitely a borderline Vivid Yellow.
VVS2 clarity - totally clean diamond.
No fluorescence- it's a "primo" stone.
The shape will look amazing in a halo or a three-stone ring. Rectangles are great that way.