Board Thread:General Discussion/@comment-26580271-20170819032137/@comment-29781728-20170819035627

Crystalline Rank - 25 to 40 due to the focus on diamond-like shapes.

Perfect Rank - 40 to 48 due to rectangles being like a "perfect shape" - equal.

OR

Closed Rank - 40 to 48 due to rectangles being closed. Also works due to how special the rank would be.